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The venturi jet draws water and air together to create directional flow at the return point
When converting a MasterTemp 300 from natural gas to propane — or replacing a worn orifice in an existing LP installation — confirm the model suffix on your heater's rating plate before ordering
and ordering the wrong size will result in a loose or non-seating fit
Replacing this switch with the correct OEM part restores the pressure threshold the heater was designed to operate within
Pentair Fan Guard | UltraTemp ETi Series | 473786Z FG1248 The venturi jet draws waterThe Pentair Fan Guard (473786Z) is the OEM replacement fan guard for the UltraTemp ETi heat pump series. This is the protective grille assembly that mounts over the fan discharge on the top of the unit. IMPORTANT: LICENSED PROFESSIONAL INSTALLATION REQUIRED Heat pump components must be serviced by a licensed pool professional or qualified HVAC technician. Do not attempt to service high voltage components without proper certification. The fan guard
