For technicians servicing residential air conditioning or commercial refrigeration units

reducing mechanical noise and wear on the fan assembly

Can the packing be serviced without removing the valve from the line

Optimized Airflow: Precision-molded components reduce backpressure

For technicians performing TXV troubleshooting and repair

Watts 0385511 Test Kit 318518-761 For technicians servicing residential airThe Watts 0385511 (Model TK 99E) is an industry standard backflow preventer test kit engineered for field service technicians who require precision and durability. This analog test kit is designed for the comprehensive evaluation of Reduced Pressure Zone Assemblies (RPZ), Double Check Valve Assemblies (DCVA), and pressure vacuum breakers. Featuring a large 4 1 2 inch anti parallax differential pressure gauge, the unit provides high visibility readings