Pentair BioShield UV Sterilizer, 45 GPM, 80W, 120/140V | 522636 Napoleon It is replaced when O-rings

It is replaced when O-rings become brittle or damaged

Manufacturer part number 521894

The Napoleon CSL42K Classic Black Surround is a decorative trim surround designed for the Ascent Linear 42 fireplace

It shields internal components and supports proper water flow through the cleaner body

Designed for retrofits

Pentair BioShield UV Sterilizer, 45 GPM, 80W, 120/140V | 522636 Napoleon It is replaced when O-ringsWhat This Part Is Used For The Pentair 522636 BioShield Ultra Violet Sterilizer 45 GPM, 80W, 120 140V provides supplemental UV sanitation for mid range flow pool systems. It treats circulating water to support overall water quality. Why This Part Matters Properly matched UV systems improve sanitation efficiency within rated flow limits up to 45 GPM. The 80W lamp supports consistent operation when installed correctly. It works alongside filtration and