O Ring Big Blue Housing

O-ring ( 5 3/4″ Outer Diameter ) for the 10″ or 20″ Sump of the large Heavy Duty “Big Blue” style filter housing.
These take the large diameter ( 4 1/2″ O.D. ) cartridges, and the length can be 10″ or 20″.
Our PN DM151122
Common “brands” include (Ametek, Plymouth, American Plumber, Pentek, and even Culligan OR-100).
Note: Only use foodgrade Silicone grease lubricant on this or any other o-ring ( otherwise o-rings will swell and shorten the life of the o-ring ).