Pentair Letro White Autofill Lid [w/Screws] (T10W) filterparts Check valves are useful because

Check valves are useful because they help prevent undesirable reverse flow that can affect equipment or plumbing performance

This replacement is especially useful when the original motor is weak

and this Polaris and Zodiac version is a white cleaning head using the 5-9-1023 reference

Dark gray pool finishes and modern renovation projects often call for skimmer components that blend better than standard white fittings

or internal heater connections that require flexible tubing suited to elevated-temperature environments

Pentair Letro White Autofill Lid [w/Screws] (T10W) filterparts Check valves are useful becauseThis Pentair service part is intended for situations where accurate fitment and dependable function matter. This item is a white autofill lid with screws for Letro Pentair water leveler applications. Use it when the original part is worn, damaged, missing, or no longer helping the system perform as intended. This part supports compatible automatic fill or water leveling systems, helping keep the assembly protected, serviceable, and visually finished