R0557100 is a replacement pressure gauge adapter that fits Jandy CV series filters. This black, plastic fitting it threaded to screw into the filter top and has a new o-ring to place on top when fastening in the existing pressure gauge. It comes packaged in a light blue cardboard backed blister pack with a clear plastic enclosure.

Pressure gauge adapter R0557100

$20.99 

Pressure gauge adapter. 

Fits: Jandy CS100, CS150, CS 200, CS250 filters.