Pentair Purex CFM/CF/SMBW Tubing Vent (75279) thermometers A volute is useful because

A volute is useful because it helps channel water through the wet end of the pump

and easy to use

and serviceability within compatible Waterway pump assemblies

the cleaner may not stay assembled properly during operation

or users who prefer to buy treatment products in a more substantial size

Pentair Purex CFM/CF/SMBW Tubing Vent (75279) thermometers A volute is useful becauseThis service part supports reliable repairs on Purex systems, helping maintain existing equipment instead of replacing a larger assembly. The tubing vent is used on CFM CF SMBW Tubing Vent applications and supports venting and routing in the filter assembly so trapped air can move properly. It is a useful replacement when the existing part is cracked, corroded, stripped, distorted, leaking, missing, or no longer holding the correct operating position.