Astralpool Pump Drain Plug Assembly - CTX / Viron / E-Series SP1116792

Astralpool Pump Drain Plug Assembly SP1116792

Genuine Astralpool pump drain plug assembly, part number SP1116792 — the threaded plug and its o-ring, supplied together. This is the plug at the base of the pump body used to drain the wet end for servicing and for winter freeze protection.

Please Note: Updated Drain Plug Design

The original drain plug featured a short shaft with a single thread. The updated design has a longer shaft with two threaded sections.

The first end-thread may be a snug fit and require a small amount of suitable lubricant to assist installation. This first retaining end-thread, located at the tip of the shaft, is designed to help retain the plug when loosened, reducing the risk of it being lost.

For older pumps: The longer shaft and retaining end-thread may need to be trimmed off to suit the original installation.

• Physically Stocked, unlike most "drop-shipping" websites.
• Shipped from VIC, NSW, WA, QLD

What It Is For

The drain plug empties the volute and lint pot. You pull it before removing the wet end for a mechanical seal or impeller job, and in frost-prone areas at the end of the season so trapped water cannot freeze and split the pump body. A cracked body from a hard frost is not a warranty claim — it is the single most avoidable pump failure we see.

When To Replace

• The plug weeps or drips when the pump is running
• The o-ring has gone hard, flat or cracked and no longer seals
• The square drive or hex head has rounded off
• The thread has been cross-threaded or stripped

Fitting Notes

Hand-tighten only. The plug seals on its o-ring, not on thread interference, so winding it down hard achieves nothing except splitting the boss. Lightly grease the o-ring with a silicone-based lubricant — never petroleum grease, which swells and destroys the elastomer. If the pump is drawing air and will not prime, a dry or perished drain plug o-ring is a prime suspect alongside the lid seal.

Related Parts

• 78103 — drain plug and air bleed o-ring on its own (buy here)
• SP40089 — complete lid assembly (buy here)
• SP40031 — volute / wet end, MkII (buy here)

Fits These Pumps

• Astralpool CTX — CTX 180, 280, 360, 400, 500 (including MkII)
• Astralpool E-Series — E 140, E 170, E 230
• Astralpool Viron XT — P320 XT, P520 XT
• Astralpool XP range

Common search terms: Astralpool SP1116792, 1116792 drain plug, CTX pump drain plug, Astral pump drain bung and o-ring, Viron XT drain plug.

Manufacturer Catalogues, Diagrams & Part Numbers

Need exploded views, spare part numbers, product numbers or diagrams? See the manufacturer catalogue: Astralpool Catalogue 2026

Before ordering: confirm this part is correct for your pump. Use the catalogue above, seek professional assistance, or contact us 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 special-order item.