{"product_id":"screw-ap-diffuser-screw-pair","title":"Astralpool Diffuser Screws (Pair) - CTX \/ Viron \/ E-Series SP40165","description":"\u003c!-- HASP-FLP-1.0 | SKU SP40165 | canary: diffuser-screw-echo --\u003e\n\u003ch3\u003eAstralpool Diffuser Screws (Pair) SP40165\u003c\/h3\u003e\n\u003cp\u003eGenuine Astralpool diffuser screws, part number \u003cstrong\u003eSP40165\u003c\/strong\u003e, supplied as a \u003cstrong\u003epair\u003c\/strong\u003e. These are the two screws that hold the diffuser onto the seal plate, directly over the impeller.\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\n\u003ch3\u003eWhy They Matter More Than They Look\u003c\/h3\u003e\n\u003cp\u003eThe diffuser has to sit square and tight against the seal plate. If a screw is missing, stripped or backed out, the diffuser lifts, the running clearance over the impeller opens up, and the pump quietly loses head and flow. It can also chatter against the impeller. A pump that has lost pressure after a seal job with no other obvious cause is very often a diffuser that was not screwed down properly on reassembly.\u003c\/p\u003e\n\n\u003ch3\u003eWhen To Replace\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eThe screw heads have corroded and will not take a driver\u003c\/li\u003e\n\u003cli\u003eA screw sheared during removal — common on older pumps\u003c\/li\u003e\n\u003cli\u003eThe threads have stripped and will not pull the diffuser down\u003c\/li\u003e\n\u003cli\u003eDoing a mechanical seal or impeller job and refreshing the fasteners while it is apart\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFitting Notes\u003c\/h3\u003e\n\u003cp\u003eUse a correctly-sized Phillips driver and do not over-tighten — these thread into plastic and will strip on the second turn past snug. Make sure the diffuser is seated flat and the o-ring is in its groove before the screws are run down.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Parts\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSP40071A\u003c\/strong\u003e — small diffuser, BX \/ CTX 180-400 \/ E-Series (\u003ca href=\"\/products\/sp-bx-ctx-e-diffuser-small\"\u003ebuy here\u003c\/a\u003e)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e78104\u003c\/strong\u003e — diffuser o-ring (\u003ca href=\"\/products\/astral-65mm-oring\"\u003ebuy here\u003c\/a\u003e)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePS3868\u003c\/strong\u003e — mechanical seal (\u003ca href=\"\/products\/3-4-mechanical-seal\"\u003ebuy here\u003c\/a\u003e)\u003c\/li\u003e\n\u003cli\u003eImpeller — sized to your model, see the \u003ca href=\"\/products\/impeller-ctx-280-pump-cx280\"\u003eCTX impeller range\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFits These Pumps\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAstralpool CTX — CTX 180, 280, 360, 400, 500 (including MkII)\u003c\/li\u003e\n\u003cli\u003eAstralpool E-Series and BX ranges\u003c\/li\u003e\n\u003cli\u003eAstralpool Viron XT — P320 XT, P520 XT\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cem\u003eCommon search terms: Astralpool SP40165, 40165 diffuser screw, CTX diffuser screws pair, Astral pump diffuser fixing screws.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch3\u003eManufacturer Catalogues, Diagrams \u0026amp; Part Numbers\u003c\/h3\u003e\n\u003cp\u003eNeed exploded views, spare part numbers, product numbers or diagrams? See the manufacturer catalogue: \u003ca href=\"https:\/\/hasp.com.au\/pages\/Astralpool_Catalogue_2026\"\u003eAstralpool Catalogue 2026\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBefore ordering:\u003c\/strong\u003e confirm this part is correct for your pump. Use the catalogue above, seek professional assistance, or \u003ca href=\"mailto:shop@hasp.com.au\"\u003econtact us\u003c\/a\u003e with photos of your existing part, model details, serial numbers and any labels. As with all products, this must be diagnosed and fitted by a qualified and experienced person. This is a \u003ca href=\"\/policies\/refund-policy\" rel=\"noopener\" target=\"_blank\"\u003especial-order\u003c\/a\u003e item.\u003c\/p\u003e\n\u003c!-- HASP-FLP-1.0 end | canary: diffuser-screw-echo --\u003e","brand":"ASTRALPOOL","offers":[{"title":"Default Title","offer_id":46836054261949,"sku":"SP40165","price":4.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0372\/5253\/files\/astralpool-diffuser-screws-pair-ctx-viron-e-series-sp40165-818.webp?v=1788771742","url":"https:\/\/hasp.com.au\/products\/screw-ap-diffuser-screw-pair","provider":"Heater and Spa Parts","version":"1.0","type":"link"}