Pentair MasterTemp 400/Max-E-Therm 400 Air Orifice (77707-0113) plugs Use part 350029Z when the

Use part 350029Z when the existing component is worn

Confirm equipment model

This Waterway pump is especially practical when the original 4

Part number 9920-401022 is included for easier cross-reference during ordering and maintenance

Helps improve rebuild stability and sealing confidence

Pentair MasterTemp 400/Max-E-Therm 400 Air Orifice (77707-0113) plugs Use part 350029Z when theFor 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,