This mechanical seal is the shaft seal for the AstralPool CTX400 pool pump: the pump seal that stops water running along the motor shaft. It fits a 3/4″ (19.05 mm) shaft. It suits pumps using Astral 75508. The same seal fits the CTX280 and CTX560.
Fits
- AstralPool CTX280
- AstralPool CTX400
- AstralPool CTX560
Fits the AstralPool CTX400
A replacement mechanical (shaft) seal for the AstralPool CTX400 pool pump. This seal suits a 3/4″ (19.05 mm) shaft, carbon / ceramic faces and suits pumps using Astral 75508. It is the two-part seal that sits behind the impeller: a spring-loaded rotating face on the shaft and a stationary seat pressed into the pump body.
Signs the CTX400 seal has failed
- water weeping from the gap between the pump body and the motor
- a rust or mineral trail running down under the motor
- the pump losing prime or drawing air at the motor end
Replace the seal as soon as it starts leaking: water tracking along the shaft into the motor is a common way pump motors lose their bearings.
The same seal is used in the AstralPool CTX, AstralPool CTX560, AstralPool CX180, AstralPool CX240, AstralPool CX280, Filtermaster SB20, Filtermaster SB30, Onga Leisuretime LTP1100, Onga Pantera PPP550, Onga Pantera PPP750, Onga Pantera PPP1100, Onga Pantera PPP1500.
Before you order
Check the old part before fitting: match the size of your old seal.
Measure the shaft where the seal sits and compare the old seal face-to-face with the photos.
Capacitor details for this pump: AstralPool CTX400 capacitor guide.