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The XYLEM 195000 is a 1-inch Test-N-Check valve sold as a set of two, designed for use in hydronic heating and boiler feed systems where periodic testing and backflow prevention are required. Manufactured under the McDonnell Miller line, this valve allows technicians to verify check valve operation without removing the component from the line, reducing service time and system downtime. The combined test-and-check function consolidates two service steps into one accessible fitting. Licensed plumbers and HVAC technicians working on low-pressure hot water boiler systems rely on this valve for both routine maintenance and compliance inspections.
This valve is suited for residential and light commercial hydronic heating applications, including boiler makeup water lines and feedwater assemblies where backflow protection is required by code. The 1-inch connection size fits standard piping configurations common in boiler rooms and mechanical spaces. The set-of-two configuration supports installations requiring paired or redundant check points within the same system.
Designed as an OEM-style replacement or new-installation component for 1-inch hydronic boiler feedwater and makeup water piping systems requiring integrated test and backflow check functionality.
Installation should be performed by a licensed plumber or qualified HVAC technician familiar with hydronic boiler systems and local plumbing codes. Shut off the water supply and depressurize the line before removing any existing valve or fitting. Follow applicable IPC and local backflow prevention requirements when positioning the check valve relative to the boiler feed connection. Do not over-tighten threaded connections; use appropriate thread sealant rated for hot water service.
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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