Hayward pressure gauge.
This boxed pressure gauge is designed to use with Micro-Clear vertical grid, Perflex extended-cycle D.E. filter
Sand filter models EC30, EC40, EC40AC, I_PFPPTS, S160T, S200, S240, S245T, S190T and also compatible
Hayward Pro Series sand filter models S210S, S244S, S310S, S140T, S144T, S180T, S210T, S220T, S220T2, S230T, S244T, S244T2, S270T, S164T, S166T.