Pentair Pentek 151120 Housing O-Ring for Standard Water Filter Housings

The O-ring is the only thing standing between the sump and the cap of a whole house filter housing, and it is the part that gives out first. Pentair Pentek part 151120 is the size 241 sump O-ring listed for the Standard housing family, so you can bring an older housing back to a clean, dry seal without replacing the vessel, the cap or the bracket.Pentair lists 151120 as the Standard O-ring accessory across three housing lines: Traditional Standard, 3G Standard and Valve-In-Head. Those housings are built with 3/4-inch NPT inlet and outlet ports in 10-inch and 20-inch lengths, are rated to 125 psi and 40 to 125 degrees F, and are designed around a leak-proof sump seal. Keeping a spare ring on the shelf means a cartridge change never turns into a plumbing call.Installation follows Pentair's standard housing procedure: coat the O-ring with food-grade silicone lubricant before seating it, thread the sump on hand tight, then add a quarter to a half turn. Use thread sealant tape on threaded connections and avoid over tightening, which distorts the ring and makes the next opening harder. Replace the O-ring at each cartridge change, or any time it looks flattened, cracked or nicked.This listing is for the sealing ring only. The filter housing, cap, sump, cartridge, wrench and mounting hardware are not included.

• RESTORES A LEAK-FREE SEAL - This is the sump O-ring that seals the bowl to the cap on Pentair Pentek Standard filter housings, so a flattened or nicked ring can be swapped in minutes instead of replacing the entire housing.
• CORRECT SIZE 241 FIT - Pentair lists this part as the number 241 O-ring for Standard housings, so it seats in the sump groove at the diameter and cross-section the housing was designed around.
• FITS THREE HOUSING FAMILIES - Listed as the Standard O-ring accessory for Pentair Pentek Traditional Standard, 3G Standard and Valve-In-Head housings, in both 10-inch and 20-inch lengths with 3/4-inch NPT ports.
• LUBRICATE BEFORE INSTALLING - Pentair housing instructions call for coating the O-ring with food-grade silicone before the sump goes back on; then hand tighten the sump, add a quarter to a half turn, and use thread sealant tape on threads.
• O-RING ONLY, HOUSING NOT INCLUDED - You are buying the replacement sealing ring by itself. This DOES NOT INCLUDE the filter housing, cap, sump, mounting bracket, wrench or cartridge; those are sold separately.