This is a back mount pressure gauge with a 1/4" MPT Threaded Mount used on Swimming Pool and Inground Style Hot Tub Sand and DE Style Filters. Hayward, Pentair, StaRite, Purex,Jacuzzi,Pacfab, Filter...
This part is a Sight Glass for Hayward, Vari-Flo Valves and GM Series Sand Filters. Comes with O-Ring Gasket.
This part will fit the follwoing models.. gm140, gm142-6, gm144, gm152, gm152HV, GM161,...