Merit Brass 416B-06 Pipe End Cap 3/8 in 304 Ss Fnpt 150 Psi

Product Description

The MERIT BRASS 416B-06 is a female NPT threaded pipe end cap machined from 304 stainless steel, designed to close off the terminal end of a 3/8-inch pipe run. Rated to 150 psi, it provides a secure, leak-resistant seal on low-pressure plumbing, instrumentation, and industrial piping systems. The 304 stainless steel construction resists corrosion in wet and mildly corrosive environments, making it a dependable choice where carbon steel fittings would degrade. Plumbers, pipefitters, and mechanical contractors install this cap to terminate or pressure-test pipe sections cleanly and permanently.

This end cap is suited for residential and light commercial plumbing systems, compressed air lines, water supply headers, and instrumentation tubing where a 3/8-inch FNPT termination is required. It threads directly onto male NPT pipe ends using standard thread-sealing tape or pipe compound. The 150 psi pressure rating covers typical domestic water, low-pressure air, and process fluid applications. It is a single-piece solid cap with no through-bore, making it appropriate for permanent line termination or temporary isolation during pressure testing.

Key Features

• 304 stainless steel construction for corrosion resistance in wet and mildly aggressive environments
• 3/8-inch FNPT connection threads directly onto standard male NPT pipe ends
• 150 psi pressure rating suitable for domestic water and low-pressure compressed air
• Threaded end connection allows installation and removal without specialized tooling
• Solid cap design provides a reliable, leak-resistant termination for open pipe ends

Compatibility

Designed as a standard FNPT threaded end cap for 3/8-inch NPT pipe systems in plumbing, HVAC piping, and light industrial applications.

Installation Notes

Installation is performed by licensed plumbers or qualified pipefitters following applicable IPC and ASME B1.20.1 thread standards. Shut off system pressure and depressurize the line before threading on the cap. Apply thread-sealing tape or approved pipe compound to the male NPT threads before engagement to ensure a leak-free seal. Do not over-torque the fitting, as stainless steel threads can gall if excessive force is applied.