This EPDM O-Ring (Part #236, replaces 151121) provides a durable, chemical-resistant seal for Pentek Slim Line and compatible filter housings with 1/4", 3/8", or 1/2" NPT cap connections. Designed to fit 6-rib housings, it measures 3-1/2" OD x 3-1/4" ID with 1/8" cross-section for reliable, leak-free performance.
TECHNICAL DETAILS
O-Ring Specifications
| Material | EPDM (Ethylene Propylene Diene Monomer) |
| Dimensions | 3-1/2" Outer Diameter, 3-1/4" Inner Diameter, 1/8" Cross-Section |
| Size Designation | AS568-236 |
| Housing Compatibility | Slim Line housings with 6-rib caps, 1/4" to 1/2" NPT connections |
| Replaces Part Numbers | 151121, 143026, PL-5000, HL-5000, Culligan OR-38 |
| Temperature Range | Standard EPDM rated for cold to warm water applications |
| Chemical Resistance | Excellent resistance to chlorine, ozone, and oxidizing chemicals |
COMPATIBILITY & APPLICATIONS
Works With Multiple Brands
This universal EPDM O-Ring fits Pentek Slim Line filter housings (5" models with 6-rib design) and is cross-compatible with Ametek, US Filter, Plymouth Products, Kleen Plus, American Plumber, Bruner, and Culligan (OR-38) systems. EPDM material is preferred for municipal water applications where chlorine and oxidizer resistance is critical. Compatible with housings using 1/4", 3/8", or 1/2" NPT threaded caps. Ideal as a replacement seal during routine filter cartridge changes to maintain housing integrity and prevent leaks.
💧 Replace your housing O-ring every 2-3 filter changes or annually, whichever comes first. A light coating of food-grade silicone grease on the O-ring before installation extends seal life and makes future removal easier.
