{"product_id":"waterco-half-barrel-unions-50mm","title":"Waterco Half Barrel Union - 50mm - 634024B","description":"\u003ch3\u003eWaterco Half Barrel Union - 50mm\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eGenuine Waterco 50mm half barrel union\u003c\/strong\u003e, comprising the threaded locking nut, the glue-in tail piece and the union O-ring. Waterco part number \u003cstrong\u003e634024B\u003c\/strong\u003e (also listed as \u003cstrong\u003e634024BLK\u003c\/strong\u003e, \u003cstrong\u003e634024\u003c\/strong\u003e, \u003cstrong\u003e1533537\u003c\/strong\u003e). This is the standard 50mm \/ 2\" union used across most of the Waterco pump range, plus Waterco filters, multiport valves and the Aquaswim, Lacron Grange and Maxi Grange badged equivalents.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003e\u003cstrong\u003ePhysically Stocked, unlike most \"drop-shipping\" websites.\u003c\/strong\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003e\u003cstrong\u003eShipped from VIC, NSW, WA, QLD\u003c\/strong\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1 x threaded barrel union locking nut\u003c\/li\u003e\n\u003cli\u003e1 x glue-in tail piece (solvent weld to 50mm PVC pressure pipe)\u003c\/li\u003e\n\u003cli\u003e1 x union O-ring\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eQuick Size Check\u003c\/h3\u003e\n\u003cp\u003eThis is the \u003cstrong\u003e50mm\u003c\/strong\u003e union. The glue socket accepts 50mm PVC pressure pipe, which has an actual \u003cstrong\u003eoutside diameter of around 60mm\u003c\/strong\u003e — not 50mm. If the pipe going into your existing union measures roughly 60mm across the outside, this is the correct size. If it measures around 48mm OD you have 40mm pipe and need the 40mm union instead. Measure the pipe, not the union nut.\u003c\/p\u003e\n\u003ch3\u003eCompatible Waterco Pumps\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eSupastream range — 50mm port models\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupastream\u003c\/strong\u003e 50, 75, 100, 125 — 50mm port (WFE1), product codes 240307550, 240310050, 240312550\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupastream\u003c\/strong\u003e 150 — 50mm port (WFE1), product code 240315050\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAquaswim Series 40S\u003c\/strong\u003e and \u003cstrong\u003eLacron Grange\u003c\/strong\u003e — same pump, alternate badging\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eSupastream was built in both 40mm and 50mm port versions. The 40mm port models take part 122243B instead, so check the port on your pump before ordering.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSupatuf range\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupatuf\u003c\/strong\u003e 75, 100, 125, 150, 200, 250, 300\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupatuf Eco 100\u003c\/strong\u003e — product code 24110005\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAquaswim Series 50\u003c\/strong\u003e — same pump, Aquaswim badging\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eHydrotuf range\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHydrotuf\u003c\/strong\u003e 100, 125, 150, 200 — product codes 2411005, 2411255, 2411505, 2412005\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eHydrostorm range\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHydrostorm\u003c\/strong\u003e 75, 100, 125, 150, 200, 250, 300, 350\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHydrostorm Eco 100\u003c\/strong\u003e — product code 2441005\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHydrostorm Eco-V 100\u003c\/strong\u003e — product code 2441009\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHydrostorm Eco-V 150\u003c\/strong\u003e — product code 2441509\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHydrostorm Plus\u003c\/strong\u003e 100, 125, 150, 200, 250\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAquaswim Series 50T\u003c\/strong\u003e and \u003cstrong\u003eMaxi Grange\u003c\/strong\u003e — same pump, alternate badging\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eNote: some Hydrostorm 1.0hp and 1.25hp pumps built around 2002 were fitted with the 50mm x 40mm reducing union 122257BLK in this position instead. Check what is on the pump before ordering.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTurboflo range\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eTurboflo 100, 125, 150, 200, 250, 300, 400\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCompatible Waterco Filters, Valves \u0026amp; Equipment\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e50mm multiport valves\u003c\/strong\u003e — Waterco top mount 228053 and 228058, side mount 2290512\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMicron side mount commercial filters\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSMD \/ SMDD side mount deep bed filters\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMicron, Thermoplastic and Hydron filters\u003c\/strong\u003e — 634024B is listed in Waterco's 50mm common parts group for this filter family\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFulflo Tri Cartridge filters\u003c\/strong\u003e — TC300, TC400, TC500\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFulflo \/ Astra D.E. filters\u003c\/strong\u003e — P2027, P2031, P2036, P2048\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eLeaf Trapper\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWill NOT Fit — Check Your Port Size First\u003c\/h3\u003e\n\u003cp\u003eWaterco uses a different union at every port size, and they are not interchangeable. If yours is not 50mm, you need one of these instead:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e40mm\u003c\/strong\u003e — part 122243B. \u003ca href=\"https:\/\/heaterandspaparts.com.au\/products\/waterco-half-barrel-unions-40mm\" title=\"Waterco 40mm Half Barrel Union\" rel=\"noopener noreferrer\" target=\"_blank\"\u003eClick here for the Waterco 40mm half barrel union\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e50mm x 40mm reducing\u003c\/strong\u003e — parts 122257BLK \/ 634024542, used where a 50mm port is plumbed down to 40mm pipe, and on Trimline MkIII cartridge filters from 2001 onward\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e65mm x 50mm\u003c\/strong\u003e — part 63406550BLK, used on Hydrostar 200–350, Hydrostorm Plus 300–400 and Supaflo\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e65mm\u003c\/strong\u003e — part 63406565B, used on Micron side mount commercial filters with 65mm ports\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e80mm\u003c\/strong\u003e — part 6340803, used on Hydrosteel and Hydrostar Commercial\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e100mm\u003c\/strong\u003e — part 6340801, used on large commercial filters and Hydron\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eAlso not this part:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMicron side mount sand filters\u003c\/strong\u003e (the standard domestic SM range) use a separate 50mm union nut (6340242B) with a threaded fitting and sweep elbow (121556, 121555, or the 121559 kit) rather than this complete half union. The 50mm union O-ring 6340241 is shared. The \u003cem\u003ecommercial\u003c\/em\u003e Micron side mount filters do take 634024B.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMultiCyclone\u003c\/strong\u003e centrifugal filters — Waterco lists a separate 50mm MultiCyclone half union, part 6340245.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOpal and Opal XL\u003c\/strong\u003e cartridge filters use their own union set (AXFI014 tail, AXFI016 lock ring, AXFI018 O-ring).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePortapac Electronic, Portapac Demand and Demand Elite, and Aquastream Solar MkI\u003c\/strong\u003e use the 50\/40mm S13185A union.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHydrostar Plus and the large commercial strainer housings\u003c\/strong\u003e (including Baker-Hydro badged commercial equipment) use 3\", 4\" and 6\" flanged or threaded port connections rather than a barrel union.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEuropean-specification Waterco equipment\u003c\/strong\u003e uses metric half unions (122245B 50mm metric, 63402400 63mm metric), which are not interchangeable with the Australian sizes.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003ePart Numbers \u0026amp; Search References\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e634024B (current Waterco part number)\u003c\/li\u003e\n\u003cli\u003e634024BLK\u003c\/li\u003e\n\u003cli\u003e634024 (Waterco Europe \/ UK reference)\u003c\/li\u003e\n\u003cli\u003e1533537\u003c\/li\u003e\n\u003cli\u003eWC634024BLK (Waterco USA reference)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnion O-ring only:\u003c\/strong\u003e 6340241 — BS332 \/ P2027-48, also referenced as W02280 in Waterco Europe catalogues\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLocking nut only:\u003c\/strong\u003e 6340242B\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCommon search terms:\u003c\/strong\u003e Waterco 50mm half union, Waterco barrel union 50mm, Waterco pump union kit, Hydrostorm union, Hydrostorm Eco-V union, Supatuf union, Supastream 50mm union, Hydrotuf union, Turboflo union, Lacron Grange union, Maxi Grange union, Aquaswim union, 634024B, Waterco 2 inch half union with o-ring, Waterco pump tail piece and nut.\u003c\/p\u003e\n\u003ch3\u003eUnderstanding 50mm Nominal Sizing\u003c\/h3\u003e\n\u003cp\u003eIn plumbing, named sizes are not measured sizes. A pipe called \"50mm\" or \"2 inch\" does not measure 50mm across — it follows nominal sizing, an internationally standardised naming convention. 50mm PVC pressure pipe has an outside diameter of approximately 60mm. Always use the OD of the pipe to confirm the fitting size.\u003c\/p\u003e\n\u003ch3\u003eFitting Notes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSolvent weld the tail piece to 50mm PVC pressure pipe using an approved priming fluid and PVC cement. Allow full cure before pressurising.\u003c\/li\u003e\n\u003cli\u003eSeat the O-ring in the tail groove and lubricate with a silicone-based lubricant only. Petroleum jelly and mineral greases swell and destroy the rubber.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHand tighten the nut only.\u003c\/strong\u003e These unions seal on the O-ring face, not on thread compression. Multi-grips and pipe wrenches crack the nut and do not improve the seal.\u003c\/li\u003e\n\u003cli\u003eIf a union weeps after tightening, the cause is almost always a nicked, flattened or dirty O-ring, or grit on the sealing face — not insufficient torque.\u003c\/li\u003e\n\u003cli\u003eSupport the pump and pipework so the unions are not carrying pipe weight or misalignment. Side load is the most common cause of a cracked union nut.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhy Replace A Barrel Union?\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCracked or split locking nut, usually from over-tightening or UV embrittlement\u003c\/li\u003e\n\u003cli\u003ePersistent weeping at the pump inlet or outlet\u003c\/li\u003e\n\u003cli\u003eAir being drawn in on the suction side, causing loss of prime or a pump that will not hold water\u003c\/li\u003e\n\u003cli\u003eStripped or cross-threaded nut that will no longer pull up square\u003c\/li\u003e\n\u003cli\u003eDamaged tail piece sealing face\u003c\/li\u003e\n\u003cli\u003eRetrofitting a new pump onto existing pipework\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eA weeping union on the suction side is worth attending to promptly. It draws air rather than leaking water, so there is no puddle to warn you, and running a pump with entrained air will damage the mechanical seal.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eHow many do I need?\u003c\/strong\u003e\u003cbr\u003eTwo for a complete pump changeover — one per port. One only if you are replacing a single failed side.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes it include the O-ring?\u003c\/strong\u003e\u003cbr\u003eYes. The union O-ring (6340241) is supplied with it. You can also buy that O-ring separately if the nut and tail are still sound.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I know I need the 50mm and not the 40mm?\u003c\/strong\u003e\u003cbr\u003eMeasure the outside diameter of the pipe entering the union. Around 60mm OD is 50mm pipe and takes this union. Around 48mm OD is 40mm pipe and takes part 122243B.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMy pump is a Supastream — is this the right one?\u003c\/strong\u003e\u003cbr\u003eIt depends on the port. Supastream was built in both a 40mm port and a 50mm port version, and Waterco lists a different union against each. The 50mm port models take this part; the 40mm port models take 122243B. Measure the pipe rather than going by the model name.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill it fit my non-Waterco pump?\u003c\/strong\u003e\u003cbr\u003eOnly if that pump was built on a Waterco body. Aquaswim, Lacron Grange and Maxi Grange are re-badged Waterco pumps and do fit. Other brands use their own thread forms — an Astralpool, Onga, Davey or Poolrite 50mm union is not interchangeable with this one even though the pipe size matches.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMy pump is 50mm but the old union looks different.\u003c\/strong\u003e\u003cbr\u003eWaterco revised the union around 2001, and some 2002 Hydrostorm 1.0hp and 1.25hp pumps were built with a 50mm x 40mm reducing union. Compare the nut thread and the tail length before ordering, and send us a photo if you are unsure.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use thread tape on it?\u003c\/strong\u003e\u003cbr\u003eNo. The seal is made by the O-ring against the port face. Tape on the barrel thread does nothing useful and can prevent the nut pulling up square.\u003c\/p\u003e\n\u003ch3\u003eNot Sure Which One You Need?\u003c\/h3\u003e\n\u003cp\u003eSend us a photo of your pump label and the existing union and we will confirm the correct part and quantity. Waterco has used at least six different union sizes across their range, and the wrong one is a wasted trip.\u003c\/p\u003e\n\u003ch3\u003eManufacturer Catalogues, Diagrams \u0026amp; Part Numbers\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eNeed exploded views, spare part numbers, product numbers, diagrams, or more product information?\u003c\/strong\u003e See the manufacturer catalogue: \u003ca href=\"https:\/\/hasp.com.au\/pages\/Waterco_Catalogue_2026\"\u003eWaterco Catalogue 2026\u003c\/a\u003e\u003c\/p\u003e","brand":"Waterco","offers":[{"title":"Default Title","offer_id":44936479637693,"sku":"r 1533537 \/ 634024B","price":64.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0372\/5253\/files\/waterco-half-barrel-union-50mm-634024b-plumbing-fittings-632.webp?v=1788783169","url":"https:\/\/hasp.com.au\/products\/waterco-half-barrel-unions-50mm","provider":"Heater and Spa Parts","version":"1.0","type":"link"}