The WH-PREFILTER-KIT-1-2025-ORING is a prefilter oring replacement for Tier1 systems that use a 20 x 2.5-inch cartridge prefilter housing. The oring is 1/8 inches wide by 3-3/4 inches inner diameter and 4 inches outer diameter. Use this replacement O-ring to ensure a tight seal on your filter housing. O-ring should be lubricated with food-grade lubricant before being installed. Replace the oring every few filter changes or if any noticeable cracking is noticed on the filter. Do not overtighten the filter sump when installing the sump, as this could potentially damage the O-ring. Inspect the area for leaks after installation before leaving.
