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Pentek (151121) Replacement O-Ring for Slim Line Housings with 1/4" & 3/8" & 1/2" NPT Connections

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Pentek (151121) Replacement O-Ring for Slim Line Housings with 1/4" & 3/8" & 1/2" NPT Connections

The Pentek 151121 Buna-N O-Ring is an FDA-grade seal designed specifically for Pentek Slim Line housings with 1/4", 3/8", and 1/2" NPT cap connections. This replacement component ensures a watertight seal on 5-inch and slim line filter housings, preventing leaks and maintaining system pressure.
SPECIFICATIONS

Pentek 151121 O-Ring Details

Manufacturer Pentek
Part Number 151121 (replaces 143026)
Material Buna-N (FDA Grade)
Outer Diameter 3-1/2 inches
Inner Diameter 3-1/4 inches
Cross Section 1/8 inch (ASS568-236)
Housing Type Slim Line, 6-rib cap design
Connection Sizes 1/4", 3/8", 1/2" NPT
INSTALLATION & USE

Replacing Your Housing O-Ring

  1. Turn off water supply and relieve system pressure before removing the filter housing sump from the cap assembly.
  2. Remove the old o-ring from the groove in the housing sump. Clean the groove thoroughly with a damp cloth to remove any sediment or mineral buildup.
  3. Lightly lubricate the new Pentek 151121 o-ring with food-grade silicone grease and seat it evenly in the groove around the sump rim.
  4. Thread the sump back onto the cap hand-tight, ensuring the o-ring remains properly seated. Do not over-tighten as this can damage the seal.
  5. Slowly turn water supply back on and inspect for leaks. If seepage occurs, relieve pressure and reseat the o-ring before retightening.
COMPATIBILITY

Cross-Reference & Applications

This o-ring is designed for Pentek Slim Line housings including PL-5000 and HL-5000 models with 6-rib caps. It is directly compatible with Culligan OR-38, Ametek, US Filter, Plymouth Products, Kleen Plus, American Plumber, and Bruner brand housings that use the same sump dimensions. The Buna-N material is suitable for municipal water applications and provides reliable performance in typical residential filtration systems. O-rings should be replaced every 1-2 years or whenever you notice reduced seal performance.

🔧 Pro Tip: Always keep a spare o-ring on hand. O-rings can degrade over time from exposure to chlorine and minerals, and having a replacement ready prevents system downtime when you need to service your filter housing.
The Pentek 151121 Buna-N O-Ring is an FDA-grade seal designed specifically for Pentek Slim Line housings with 1/4", 3/8", and 1/2" NPT cap connections. This replacement component ensures a watertight seal on 5-inch and slim line filter housings, preventing leaks and maintaining system pressure.
SPECIFICATIONS

Pentek 151121 O-Ring Details

Manufacturer Pentek
Part Number 151121 (replaces 143026)
Material Buna-N (FDA Grade)
Outer Diameter 3-1/2 inches
Inner Diameter 3-1/4 inches
Cross Section 1/8 inch (ASS568-236)
Housing Type Slim Line, 6-rib cap design
Connection Sizes 1/4", 3/8", 1/2" NPT
INSTALLATION & USE

Replacing Your Housing O-Ring

  1. Turn off water supply and relieve system pressure before removing the filter housing sump from the cap assembly.
  2. Remove the old o-ring from the groove in the housing sump. Clean the groove thoroughly with a damp cloth to remove any sediment or mineral buildup.
  3. Lightly lubricate the new Pentek 151121 o-ring with food-grade silicone grease and seat it evenly in the groove around the sump rim.
  4. Thread the sump back onto the cap hand-tight, ensuring the o-ring remains properly seated. Do not over-tighten as this can damage the seal.
  5. Slowly turn water supply back on and inspect for leaks. If seepage occurs, relieve pressure and reseat the o-ring before retightening.
COMPATIBILITY

Cross-Reference & Applications

This o-ring is designed for Pentek Slim Line housings including PL-5000 and HL-5000 models with 6-rib caps. It is directly compatible with Culligan OR-38, Ametek, US Filter, Plymouth Products, Kleen Plus, American Plumber, and Bruner brand housings that use the same sump dimensions. The Buna-N material is suitable for municipal water applications and provides reliable performance in typical residential filtration systems. O-rings should be replaced every 1-2 years or whenever you notice reduced seal performance.

🔧 Pro Tip: Always keep a spare o-ring on hand. O-rings can degrade over time from exposure to chlorine and minerals, and having a replacement ready prevents system downtime when you need to service your filter housing.
$0.73

Original: $2.10

-65%
Pentek (151121) Replacement O-Ring for Slim Line Housings with 1/4" & 3/8" & 1/2" NPT Connections—

$2.10

$0.73

Description

The Pentek 151121 Buna-N O-Ring is an FDA-grade seal designed specifically for Pentek Slim Line housings with 1/4", 3/8", and 1/2" NPT cap connections. This replacement component ensures a watertight seal on 5-inch and slim line filter housings, preventing leaks and maintaining system pressure.
SPECIFICATIONS

Pentek 151121 O-Ring Details

Manufacturer Pentek
Part Number 151121 (replaces 143026)
Material Buna-N (FDA Grade)
Outer Diameter 3-1/2 inches
Inner Diameter 3-1/4 inches
Cross Section 1/8 inch (ASS568-236)
Housing Type Slim Line, 6-rib cap design
Connection Sizes 1/4", 3/8", 1/2" NPT
INSTALLATION & USE

Replacing Your Housing O-Ring

  1. Turn off water supply and relieve system pressure before removing the filter housing sump from the cap assembly.
  2. Remove the old o-ring from the groove in the housing sump. Clean the groove thoroughly with a damp cloth to remove any sediment or mineral buildup.
  3. Lightly lubricate the new Pentek 151121 o-ring with food-grade silicone grease and seat it evenly in the groove around the sump rim.
  4. Thread the sump back onto the cap hand-tight, ensuring the o-ring remains properly seated. Do not over-tighten as this can damage the seal.
  5. Slowly turn water supply back on and inspect for leaks. If seepage occurs, relieve pressure and reseat the o-ring before retightening.
COMPATIBILITY

Cross-Reference & Applications

This o-ring is designed for Pentek Slim Line housings including PL-5000 and HL-5000 models with 6-rib caps. It is directly compatible with Culligan OR-38, Ametek, US Filter, Plymouth Products, Kleen Plus, American Plumber, and Bruner brand housings that use the same sump dimensions. The Buna-N material is suitable for municipal water applications and provides reliable performance in typical residential filtration systems. O-rings should be replaced every 1-2 years or whenever you notice reduced seal performance.

🔧 Pro Tip: Always keep a spare o-ring on hand. O-rings can degrade over time from exposure to chlorine and minerals, and having a replacement ready prevents system downtime when you need to service your filter housing.
Pentek (151121) Replacement O-Ring for Slim Line Housings with 1/4" & 3/8" & 1/2" NPT Connections | Isopure Water