Hayward SwimClear/XStream Air Relief w/O-Ring (CCX1000V) pleatco A lid like this is

A lid like this is useful because it helps seal and protect the trap area while still allowing the user to access the basket or chamber for routine cleaning and service

This part is especially useful when troubleshooting a 3900 that moves poorly

Matching those details helps preserve cleaner fit and more dependable service results

It helps support quick patching

Designed for compatible post-5/03 non-VH systems

Hayward SwimClear/XStream Air Relief w/O-Ring (CCX1000V) pleatco A lid like this isAir relief assemblies allow trapped air to be released from the filter tank during startup and service. This Hayward SwimClear XStream air relief with O ring replaces worn or leaking relief hardware on compatible cartridge filter systems. Air relief assembly with O ring for compatible SwimClear and XStream filters Helps release trapped air from the filter tank Useful when the original air relief leaks, sticks, or becomes damaged Supports safer, more