B K/mueller Inds(import) 521-400HC Black Pipe Cap 1/8 in

Product Description

The B K/MUELLER INDS(IMPORT) 521-400HC is a 1/8-inch black pipe cap designed to terminate open pipe ends in gas, air, and other compatible piping systems. Pipe caps thread onto the outside of male pipe ends to seal them against leakage, contamination, or pressure loss. This cap ships in a package quantity of 25 units, making it practical for job-lot stocking and multi-point installations. Licensed plumbers, pipefitters, and HVAC technicians commonly use black pipe caps when capping off unused branch lines or during system pressure testing. The black steel finish is standard for natural gas and propane distribution piping in residential and light commercial settings.

This cap is suited for 1/8-inch NPT male pipe ends in residential and light commercial applications. Common installation scenarios include capping unused tee outlets on gas manifolds, sealing branch lines during rough-in, and closing off test ports after pressure checks. The 25-unit package is well suited for contractors who work multiple service calls or installations and need consistent, job-ready stock on hand.

Key Features

• 1/8-inch size fits standard NPT male pipe ends
• Black finish is compatible with natural gas and propane piping systems
• Threaded cap design provides a secure, leak-resistant seal on open pipe ends
• Sold in a 25-unit package for job-lot efficiency
• Compact and lightweight at 0.78 pounds per package of 25

Compatibility

Designed as an OEM-style replacement or standard-stock fitting for 1/8-inch NPT male pipe ends in residential and light commercial gas, air, and compatible fluid piping systems.

Installation Notes

Installation is performed by licensed plumbers or pipefitters in accordance with local plumbing codes and IFGC requirements. Shut off and depressurize the supply line before threading the cap onto the pipe end. Apply thread sealant or tape rated for the service medium before installation. Do not over-tighten; hand-tight plus wrench turns appropriate to the pipe material and service pressure per applicable code.