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Cherne mechanical pipe plug 3-1/2 inch ABS plastic natural rubber glass reinforced 2.2 inch height

Cherne

Cherne 270138 Mechanical Pipe Plug 3-1/2 In Trap

SKU CH-DNNV-DKXS8 MPN 270138

Mechanical pipe plug seals 3-1/2 inch pipes with ABS and glass-reinforced rubber, handling 17 psi air or 40 ft water head

  • TypeDrain Components
  • Fits pipes with internal diameters from 3.78 to 4.25 in
  • Holds up to 17 psi air pressure for reliable sealing
  • Withstands 40 ft of water head for hydrostatic testing
  • Low 2.2 in profile installs in tight access spaces
  • ABS plate with glass-reinforced natural rubber resists corrosion and wear

3-1/2 Inch Mechanical Pipe Plug

The Cherne 270138 is a mechanical pipe plug designed to seal 3-1/2 inch pipes during testing or maintenance. It fits pipe inside diameters from 3.78 to 4.25 inches. The body uses ABS plastic with glass-reinforced natural rubber sealing elements. A water fill port and hose are not included with this unit.

Suits pressure testing and temporary blockage

This plug suits technicians who need a reusable seal for 3-1/2 inch pipe systems. It handles air pressure up to 17 psi and water pressure up to 40 ft of head. It is not for permanent installation or for pipes outside the stated diameter range. Buyers needing a bypass connection or a padlock shackle should look elsewhere.

17 psi maximum air back pressure

The decisive specification is the 17 psi maximum air back pressure rating. This limit determines whether the plug will hold during your specific test procedure. Verify your system pressure against this figure before selecting this model.

Highlights

  • Fits pipes with internal diameters from 3.78 to 4.25 in
  • Holds up to 17 psi air pressure for reliable sealing
  • Withstands 40 ft of water head for hydrostatic testing
  • Low 2.2 in profile installs in tight access spaces
  • ABS plate with glass-reinforced natural rubber resists corrosion and wear

Specifications

TypeDrain Components
BrandCherne Industries
Model270138

Questions about this item

How do I install the Cherne 270138 mechanical plug in a 3-1/2 inch trap, and what step is often missed?

Insert the plug into a pipe with an inside diameter between 3.78 in and 4.25 in, then tighten the mechanism until the rubber seals fully; the step often missed is verifying the pipe ID falls in that range before insertion.

What maintenance or replacement will the Cherne 270138 plug need over time?

The natural rubber sealing element will degrade with age and chemical exposure; inspect it before each use and replace the plug if the rubber shows cracking, hardening, or loss of elasticity.

What is the first limit reached when the Cherne 270138 plug is under sustained pressure?

The 17 psi maximum back pressure for air is the first limit reached under sustained pneumatic testing; for water the limit is 40 ft of head.

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