Pentair Water Bypass Assembly | ETi® 400 Heater | 475621 Trichloride Apply a coat of Pentair

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

The Pentair Center Core (59053800) is the OEM replacement structural core for Pentair Clean & Clear

Pentair Bermuda Gunite Skimmer 506361 Bermuda Skimmer accessory — float valve assembly

Filters produced before that date require a different assembly

even coat of Pentair R172351 Lifeguard® Silicone Lubricant to help each ring seat correctly and prevent tearing during assembly

Pentair Water Bypass Assembly | ETi® 400 Heater | 475621 Trichloride Apply a coat of PentairThe 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