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The DWYER INSTRUMENTS TL20-100-4L is a Trade Line pressure gauge designed for general HVAC and mechanical service applications. Built for use with air, oil, water, gas, and other media that are compatible with brass internals, this gauge provides reliable pressure or vacuum readings in field and service environments. It is suited for use by HVAC technicians, plumbers, and mechanical contractors who require a dependable, no-frills instrument for routine system monitoring and diagnostics.
This gauge is intended for general service conditions across a wide range of fluid and gas media. Typical applications include pressure checks on HVAC refrigerant circuits, air lines, water systems, and oil systems where the media does not chemically attack brass components. It fits naturally into the toolkit of service technicians working on both residential and light commercial mechanical systems.
Designed as an OEM-style replacement and general-service gauge for HVAC, plumbing, and mechanical systems where the process media does not attack brass wetted parts.
Installation should be performed by a licensed HVAC technician, plumber, or qualified mechanical contractor. Isolate and depressurize the system before removing or installing any gauge. Verify thread type and size before installation to ensure a proper seal and prevent leaks. Follow all applicable local codes and manufacturer guidelines for instrumentation installation.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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