Pentair MasterTemp 400/Max-E-Therm 400 Air Orifice (77707-0113) plugs Helps protect heat exchanger performance

Helps protect heat exchanger performance

and WhisperFlo pump applications

a correctly matched replacement can restore a much better day-to-day experience

2 foot length

Helps improve rebuild stability and sealing confidence

Pentair MasterTemp 400/Max-E-Therm 400 Air Orifice (77707-0113) plugs Helps protect heat exchanger performanceFor service work on Pentair pool equipment, choosing the exact replacement part helps reduce callbacks and installation delays. This MasterTemp 400 Max E Therm 400 Air Orifice is used in the heater combustion system to help meter the air path for the correct burner configuration. Because orifice sizing affects how the heater breathes and fires, this is a precision replacement part rather than a generic fitting. Always compare the existing part,