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The DWYER INSTRUMENTS tl20-100-8b is a utility water pressure gauge designed for straightforward pressure monitoring in plumbing and light industrial applications. The gauge features a 2 inch dial face with a 100 psi pressure range, making it easy to read in tight spaces. The 1/8 inch male pipe thread (MPT) back mount connection allows direct installation into a back-port fitting or tee without additional adapters in many common configurations. Plumbers, HVAC technicians, and general mechanical contractors typically install this type of gauge for system diagnostics and ongoing pressure monitoring.
This gauge is suited for residential and light commercial water systems where a compact, back-mount dial gauge is needed. The back mount orientation positions the dial face away from the pipe, making it readable when mounted on walls, panels, or pipe risers. The 100 psi range covers typical domestic water supply pressures, boiler system pressures, and low-pressure process lines. It is a utility-grade instrument appropriate for general service rather than precision measurement or high-vibration environments.
Designed as an OEM-style replacement or direct-install utility pressure gauge for residential and light commercial plumbing, hydronic heating, and general water system applications requiring a 1/8 inch MPT back mount connection.
Installation is typically performed by a licensed plumber or mechanical contractor. Shut off and depressurize the system before removing or installing any pressure gauge. Apply thread sealant tape or pipe dope to the MPT threads before threading in the gauge to prevent leaks. Tighten by hand first, then snug with a wrench — do not overtighten, as over-torquing can crack the gauge body or fitting.
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