Pentair Sta-Rite MasterTemp 400/Max-E-Therm 400 LP Orifice (77707-0441) correcttech Replacing a compromised seal plate

Replacing a compromised seal plate often makes the difference between a short-term fix and a wet end that actually feels properly restored

Helps seal water-side heater connections

or no longer provides the fit needed for a clean rebuild

and make the cleaner less effective in certain areas of the pool

Pentair Sta-Rite MasterTemp 400/Max-E-Therm 400 LP Orifice (77707-0441) correcttech Replacing a compromised seal plateThis 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