Pentair Rodent Resistant Air Orifice Protection Cap for MasterTemp & Max-E-Therm Heaters | 475265

The Pentair Rodent Resistant Air Orifice Protection Cap (475265) is the OEM replacement protective accessory for the MasterTemp and Max-E-Therm series pool and spa heaters, engineered to block rodent intrusion through the heater's air orifice opening.

IMPORTANT: HEATER COMPONENT — PROFESSIONAL SERVICING REQUIRED
Gas and electrical heater components must be serviced by a licensed pool professional or qualified HVAC technician. Do not attempt to service gas or high-voltage components without proper certification.

Rodents can enter a heater's air orifice during periods of inactivity — particularly during winter shutdowns or extended off-seasons — leading to damage of internal burner components and creating a potential safety hazard. This cap installs over the air orifice opening to block access while preserving the airflow characteristics required for proper heater ignition and combustion.

Specifications

Fits Into

Compatibility is based on Pentair parts documentation and available OEM records. This is not an exhaustive list. For certainty, verify the part number in your equipment's manual or on the original part itself before ordering.

Poolaroo Pro Tip

Install this cap at the end of the swim season and remove it before your heater's first startup of the year — it's an easy addition to any seasonal shutdown or startup checklist. If your heater has experienced an unexplained ignition failure after a period of non-use, inspect the air orifice for nesting material or debris before replacing any ignition components; a blocked orifice is a common and easily overlooked cause of startup issues. Gas and electrical heater components must be serviced by a licensed pool professional or qualified HVAC technician — do not attempt to service gas or high-voltage components without proper certification.