Line Tester 

Function: Forged brass body, 1"(2.5cm) female NPT inlet x 1/2"(1.2cm) female outlet(sprinkler head) x 1"(2.5cm) NPSH drain outlet with cap and chain and wrench-operated shutoff. Installed with the last sprinkler head on system branch lines. Controls water flow for flushing or testing of the system.