Pentair Water Bypass Assembly | ETi® 400 Heater | 475621 Trichloride The volute is the wet-end

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

locate the part number molded or stamped on your existing valve assembly and match it to 270068

Apply a coat of Pentair R172351 Lifeguard Silicone Lubricant to the O-ring before seating it — this helps it compress evenly

" this is the correct weir assembly for your unit

Pentair Water Bypass Assembly | ETi® 400 Heater | 475621 Trichloride The volute is the wet-endThe 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