Pentair Piston Assembly [Slide Valve, Push-Pull Kit] (263055) pleatco and this Polaris and Zodiac

and this Polaris and Zodiac version is a black assembly designed for 380 cleaner applications using the 9-100-7007 reference

Replacing the internal assembly can help restore more dependable filtration without replacing the full filter tank

and PBH50 references

This replacement is especially useful when the original component is cracked

Pentair Piston Assembly [Slide Valve, Push-Pull Kit] (263055) pleatco and this Polaris and ZodiacThis piston assembly is built for compatible Pentair slide valve and push pull valve service. Push pull valves rely on a smooth moving piston to shift flow between filter and backwash functions, and wear in this area can lead to leaks, hard operation, poor sealing, or incomplete valve movement. Replacing the piston assembly helps restore controlled valve action without replacing the full valve body. It is useful during backwash valve rebuilds,