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The BMI 6503 is a lead-free brass cap fitting designed to terminate or seal open pipe ends in plumbing systems. Machined from brass stock, this cap threads onto a 3/8 inch pipe end to create a secure, pressure-tight closure. Lead-free construction meets current drinking water compliance standards, making it suitable for use on potable water lines. Plumbers and pipefitters install this type of fitting during system testing, when capping unused branch lines, or when closing off supply stubs during rough-in work. The compact profile fits into tight spaces without requiring special tooling.
This cap is appropriate for residential and light commercial plumbing applications where a reliable, code-compliant pipe termination is required. Common installation scenarios include capping off supply lines during phased construction, sealing unused ports on manifolds, and pressure-testing completed rough-in assemblies. The brass material handles standard domestic water supply pressure ranges without deformation or corrosion issues common with lower-grade alloys.
Designed as a standard threaded brass cap for 3/8 inch pipe ends in residential and light commercial plumbing systems.
Installation is performed by a licensed plumber or qualified pipefitter. Shut off the water supply and relieve system pressure before threading any cap onto an open line. Apply thread sealant tape or compound to the male pipe threads before installation and tighten to hand-tight plus wrench-snug — do not over-torque brass fittings. Verify the joint is leak-free before returning the system to service.
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