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The MUELLER INDUSTRIES 100-405NL is a lead-free brass compact gate valve designed for full-flow shutoff in residential and commercial plumbing systems. The compact body profile and non-rising stem make this valve a practical choice where installation space is limited. Built from brass construction, it connects via 1-inch female iron pipe (FIP) threads on both ends. Licensed plumbers and mechanical contractors install this valve in supply lines, branch connections, and service entry points where a standard full-size gate valve will not fit. The lead-free designation meets regulatory requirements for potable water service.
This valve suits indoor residential and commercial plumbing applications as well as outdoor installations where space constraints rule out a standard-pattern gate valve. The non-rising stem design keeps the valve's vertical footprint fixed during operation, making it well suited for installation inside wall cavities, utility chases, mechanical rooms, and other confined locations. It is appropriate for use on cold and hot water supply lines within typical plumbing system pressure and temperature ratings.
Designed as an OEM-style replacement or new-installation compact gate valve for 1-inch female iron pipe thread plumbing systems in residential and commercial applications.
Installation should be performed by a licensed plumber in accordance with local plumbing codes and the International Plumbing Code (IPC). Shut off the main water supply and relieve system pressure before removing or installing any valve. Apply an approved thread sealant tape or compound to male threads before making up the FIP connections. Do not overtighten threaded connections, as brass fittings can crack under excessive torque.
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