Pentair Water Bypass Assembly | ETi® 400 Heater | 475621 Trichloride Filters produced before that date

Filters produced before that date require a different assembly

Replace both components together to avoid reopening the connection a second time

The volute is the wet-end housing that surrounds the impeller and directs water flow from the pump inlet through to the discharge port

A damaged or deteriorated flameholder can result in ignition failure

Pentair Water Bypass Assembly | ETi® 400 Heater | 475621 Trichloride Filters produced before that dateThe Pentair Water Bypass Assembly (475621) is the OEM replacement bypass assembly for the Pentair ETi 400 Heater, restoring proper water flow regulation within the heater's internal plumbing circuit. IMPORTANT: LICENSED PROFESSIONAL INSTALLATION 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