OUR VINYL HOSE BEND RESTRICTOR HELPS TO PROLONG THE LIFE OF YOUR PVC SPRAY HOSE CONNECTIONS BY ADDING STIFFNESS AT THE CRITICAL POINT WHERE THE HOSE LEAVES THE BARB.  IT ALSO COVERS ANY SHARP EDGES ON THE BAND CLAMPS. THE 3/8 SIZE IS .70 " INSIDE DIAMETER TO FIT MOST 3/8" HOSES.