Pentair Sta-Rite MasterTemp 400/Max-E-Therm 400 LP Orifice (77707-0441) valveparts CMP heavy-duty plastic anchor wedge

CMP heavy-duty plastic anchor wedge

or heavy use

The CMP generic backwash valve piston assembly is designed for compatible slide-valve applications where the internal piston section needs replacement

while the 240V configuration helps keep the replacement aligned with the system’s intended electrical design

making it especially valuable when cleaner long-distance routing is part of the repair or installation plan

Pentair Sta-Rite MasterTemp 400/Max-E-Therm 400 LP Orifice (77707-0441) valveparts CMP heavy-duty plastic anchor wedgeThis LP orifice is used in compatible MasterTemp 400 and Max E Therm 400 heaters configured for propane operation. It helps meter propane flow to the burner system, making correct model and fuel matching essential. If the heater is being serviced after gas train work, conversion work, or a combustion related diagnosis, the orifice should be inspected and verified. Gas heater parts should be installed only by qualified personnel who can confirm safe