Astralpool Pump Check Valve Assembly

Astralpool Pump Check Valve Assembly 598770

Genuine Astralpool / Hurlcon in-pump check valve, part number 598770, for the E, CX, TX and CTX pumps. Suits both 40mm and 50mm unions. It prevents impeller "spin-off" — water rushing backwards through the pump when it switches off — and helps the pump hold prime between cycles.

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

Important Notes Before Ordering

• Supplied only in the current style shown in the first image. The older black-fitting style (second image) is discontinued; the new version suits most applications.
• In some 40mm-tail installations the flap will not fully open, and there is no way to know until you try. If it does not open fully, fit a separate check valve above the pump instead.
• Where possible we recommend a good-quality check valve fitted to the pump outlet.

A Note on Check Valves and Safety Systems

Astralpool cautions that a check valve can interfere with the operation of certain Suction Vacuum Release Systems (SVRS). If your pool has an SVRS fitted, review its manual before installing an in-line check valve. On pumps installed below water level, isolation (check) valves on both suction and return lines are what let you service the pump without draining the lines.

Related Parts

• 40065 — basket (buy here)
• 70006 — lid o-ring (buy here)
• 75508 / PS3868 — mechanical seal (buy here)
• Impeller — sized to your model, see the CTX impeller range

Manufacturer Catalogues, Diagrams & Part Numbers

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

Common search terms: Astralpool 598770, CTX check valve, in-pump check valve, Astral Hurlcon non-return valve, pump anti-spin-off valve, 40mm 50mm check valve.