This handy easy-to-adjust Claw Tensioner is made out of strong lightweight plastic material for long life. The Starfish is especially designed for parallel parlor milking because its “legs” catch on the rail to hold the tensioner and hoses in the proper position. Adjust the Starfish grip on the milk hose with a slight squeeze of the air hose guides. Will not interfere with detacher function. For 5/8” and 3/4" milk hose.