Description
| Part Number | 151121 |
| Alternate Part Numbers | Pentek 151121; American Plumber W38-OR , 152031; Ametek 151121; Campbell 10800-034; Culligan OR-38; GE WS03X10001; Hydroviv 3100010080; Watts WP113029, 113029, OR-4 |
| Compatible with: | See below for full compatibility list. |
| O-Ring Inside Diameter | Approximately 3-3/8″ (3.36″ actual) |
| O-Ring Thickness | 0.14 inches (slightly over 1/8″) |
| O-Ring Material | NSF61 Certified (Drinking Water Safe) Buna Nitrile Rubber |
| Grease/Lubricant Compatibility | No grease required. Simply wet the o-rings with water then install. Compatible with silicone and petroleum based greases if desired. |
Captain O-Ring’s replacement 151121 o-rings are compatible with the following filter housings listed below (and others that call for this part number):
- Pentek/Pentair 3G Slim Line Series (158598, 158601, 158606, 158608, 158642, 158643, 158647, 158620, 158621, 158622, 158623, 158648, 158649, 158794)
- Pentair/Pentek Counter Top Slim Line Series (158177, 158179)
- Pentair/Pentek Flat Cap Slim Line Series (158739, 158784, 158785)
- Pentair/Pentek Standard Flat Cap Series (158759, 158753)
- Pentair/Pentek Traditional Slimline Series (158133, 158138, 158114, 158115, 158116, 158117, 158120, 158125, 158126, 158326, 158131, 158841, 158002, 158003, 158110, 158111, 158005, 158006, 158007, 158008, 158149, 158098, 158129, 158842, 158203, 158195, 158196, 158214, 158215, 158765, 158204, 158205)
- Ace Hardware 45335, 45449, 48166, 49562, 4001699, 4158515
- American Plumber W38-PR, W38-PRA, WLCS-500, WRO-3167
- Ametek Kleen-Plus / Pentek CSL-CIK, CCF-201, CTR-CMR-10, PSCL-C2, US-560, US-560K, SY-5167, SY-5197
- Culligan RVF-10, US-316, US-550
- GE GN1S15CBL, GN1S20C, GNSL05CBL, GNSV25CBL, GNSV30CCC, GNSV30CWW, GX1S01C, GX1S04C, GX1S15C, GXRV10ABL, GXSL03C, GXSV10C, PNRV12ZBL01, PNRV12ZWH01
- Glacier Bay HDGUSS4, HDG2BS4
- Hydroviv Undersink Water Filter, Refrigerator/Ice Maker Water Filter
- Watts/Flowmatic 500, 4000, 4200, 7000, RO-TFM-4SV-W50, RO-TFM-5SV-W50
- US Filter RO-2127, RO-2300, RO-2300-A, RO-3167

![Pentek Pentair 151121 O-Ring (3 Pack) [Culligan OR-38, GE WS03X10001]](https://www.diyhardwareshop.com/wp-content/uploads/2026/07/pentek-pentair-151121-o-ring-3-pack-culligan-or-38-ge-ws03x10001.webp)

