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Stainless steel threaded pipe cap, 1 1/2 inch FNPT, brushed silver finish

Value Brand

Value Brand Stainless Steel Threaded Cap 1 1/2 in FNPT Class 150

SKU CH-S4SQ-WZ1Y9

Stainless steel pipe cap with 1 1/2 inch FNPT threading, Class 150 pressure rating up to 300 psi, and -20 to 350 °F temperature range

  • 304 stainless steel resists corrosion in harsh environments
  • Class 150 rating handles 300 psi water and 150 psi steam
  • FNPT 1 1/2 in threads seal without welding
  • Operates from -20 to 350 °F across diverse systems
  • Meets ASTM A351, ANSI B1.20.1 and MSS-SP-114 standards

Stainless Steel Pipe Cap 1 1/2 in

This Value Brand cap is a 304 stainless steel pipe fitting designed to close and seal the end of a pipe, stopping flow and protecting the interior. It features a 1 1/2 inch FNPT threaded connection suitable for Schedule 40 pipe. The fitting conforms to ASTM A351 and ANSI B1.20.1 standards with a Class 150 pressure rating. It serves plumbers and maintenance technicians terminating lines or performing pressure tests.

Build Quality and Threaded Connection

The cap is constructed from 304 stainless steel offering corrosion resistance across a temperature range of -20 Degrees to 350 Degrees F. It measures 36 mm in overall length and is not magnetic, with no pre-applied thread sealant included. The FNPT threading follows ANSI B1.20.1 specifications ensuring compatibility with matching 1 1/2 inch nominal pipe fittings. Installers must apply their own sealant during assembly for a proper seal.

Pressure Class 150 Upgrade Considerations

This fitting replaces worn or missing caps in systems requiring a maximum operating pressure of 300 psi and maximum steam pressure of 150 psi. It meets MSS-SP-114 Class 150 pressure ratings for reliable line termination and system extensions. The jump is worth it when existing caps fail to meet ASTM A351 material standards or ANSI threading requirements. Buyers needing higher pressure classes or different connection types must select alternative fittings.

How it compares

Measured against everything we stock in Hose Fittings, Adapters & Clamps, at today’s prices. Recalculated every night.

Price $10.99
Cheaper than about 68% of the 2,955 comparable items (median $17.99).

Specifications

Product
Brand nameZORO SELECT

Questions about this item

What pressure does the Class 150 rating allow at 300 psi water and 150 psi steam?

Class 150 rates this cap for 300 psi maximum operating pressure and 150 psi maximum steam pressure per MSS-SP-114.

Which pipe schedule and nominal size does the 1 1/2 in FNPT threading match?

The FNPT threads follow ANSI B1.20.1 for 1 1/2 inch nominal size and are constructed for Schedule 40 pipe.

How do I install the cap without leaks on 304 stainless threads?

Clean threads, apply PTFE tape or pipe dope clockwise, hand-tighten, then wrench-tighten one to two turns — skipping sealant is the common mistake.

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