The Coxreels 131-3 is a rubber hose stop for spring driven reels with 3/8" I.D., 21/32" O.D. hoses or 10/3 SO cords. Overall diameter 2-1/2". It makes an adjustable lead length for the hose and keeps the hose from retracting too far. Two screws are used to make adjustments. When installing, make sure the screws are not over-tightened so they do not damage the rubber. Note: Image is for reference, actual part may differ. Ground shipping only