Astralpool Volute (Wet End) & Basket - CTX Series 1 4007502

Astralpool Volute (Wet End) & Basket - CTX Series 1 4007502

This is the genuine Astralpool Series 1 volute, part number 4007502, supplied with the basket. The volute is the main pump body (wet end) that houses the impeller, diffuser and basket. This is the original, old-style volute used on CTX and TX/CX/E pumps built before August 2014.

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

Three Generations — Order the Right One

Astralpool changed the CTX wet end twice. The volute and its matching seal plate must come from the same generation as your pump, or they will not bolt up and seal correctly. Identify your pump's era before ordering:

Generation	Volute (wet end)	Seal plate
Series 1 — old style, pre-Aug 2014	4007502 — this product	4009002
Series 2 — Aug 2014 to 2018	40097	40098
MkII — Nov 2020 onwards	SP40031	SP40030

If you are not sure which generation your pump is, send us a photo of the pump and its data plate and we will identify it. This is an expensive part to order wrongly.

What the Volute Is

The volute is the moulded pump body that the motor bolts onto. It holds the basket, the diffuser and the impeller, and forms the pressure chamber that converts the impeller's spin into water flow. It is replaced when the body is cracked, when a union or port thread has failed, or when the internal sealing faces are damaged beyond what a new seal plate and o-rings will fix.

Related Series 1 Parts

• 4009002 — seal plate, Series 1 old style (black)
• 70004 — square seal plate o-ring, old style EPDM (buy here)
• 75508 / PS3868 — mechanical seal, BX / TX / CX / E / CTX (buy here)
• 40065 — basket (buy here)
• 40089 — lid complete with o-ring (buy here)
• 70006 — lid o-ring (buy here)
• Impeller — sized to your CTX model, see the CTX impeller range

Frequently Asked Questions

How do I know if my pump is Series 1?
Series 1 pumps were built before August 2014. If your pump predates that, or the old seal plate is marked 4009002, you are on Series 1 and this is the correct volute. If unsure, send us a photo of the data plate.

Can I fit a Series 2 or MkII volute to a Series 1 pump?
The generations are not cross-compatible as a mix. The volute, seal plate and their o-rings changed together. Match the whole wet end to one generation.

Does it come with the basket?
Yes, this part is supplied with the basket.

Is this a genuine Astralpool part?
Yes. We are an authorised Astralpool and Fluidra dealer and warranty agent.

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.

Common search terms: Astralpool 4007502, CTX volute Series 1, CTX wet end old style, Astral Hurlcon CTX pump body, pre-2014 CTX volute.