This Upgraded edition is the only version of Watts TK-9A equipped with both Line Pressure Gauge and Testcock Adapters. The Watts TK-9A Upgrade is a 3-valve test kit used by certified backflow testers for testing all makes, models and sizes backflow preventer assemblies, including irrigation, domestic, fire, isolation, and containment. The Watts TK-9A upgraded version backflow test kit ships fully assembled and with everything needed to start testing right away: 3 hoses, 3 testcock adapters, and calibration certificate valid for 1 year. The Watts TK-9A backflow test Kit is used for testing the following domestic, irrigation and fire-line backflow preventer assemblies: Reduced Pressure Zone (RPZ) Double Check Valve (DC) Pressure Vacuum Breaker (PVB) Spill-resistant Pressure Vacuum Breaker (SPVB) Reduced Pressure Detector Assembly (RPDA) Double Check Detector Assembly (DCDA) 3-valve configuration (high, low and bypass) 4.5" differential pressure gauge; scale: 0 -15 PSID, Extra FREE line pressure gauge for recording system pressure, now required by most water purveyors. DISCLAIMER: THE AFTERMARKET GAUGE UPGRADE IS PERFORMED BY ACUGAUGE AND IS NOT ENDORSED OR APPROVED BY WATTS.