Rusco AFV-KIT Automatic Flush Valve Installation Kit (2) 1/2quot; Barb x 1/2quot; NPT male hose fittings. (2) SAE size 8 SS worm drive clamps. 24quot; x 1/2quot; Braid reinforced flexible PVC tubing rated at 215 PSI. This kit assists the installation of the Rusco Automatic Flush Valve#44; which is popular for applications The Rusco AFV Automatic Flush Valve has an adjustable cycle time of 5 minutes to 24 hours.