![6″ External Plain Black Cap & Gasket](http://reefloat.com/cdn/shop/files/lid_InPixio2_{width}x.jpg?v=1708463033)
there are 2 versions available depending on original AWC purchase (the 2 types are not interchangeable so its important the correct version is selected)
type 1 uses an "O" ring (may be with or without foam washer)
type 2 uses a flat washer
see attached pics