The stopper is suitable for use with auto rewind retractable hose reel and the replacement of spring drive air hose reel ball stopper Adjustable bumpers are molded rubber assuring a long life and nonslip grip. Just place the ball stopper in the desired, insert the screw and tighten the nut Suitable for use with automatic rewind retractable hose reels and springdriven air hose reel stopper, ensuring broad applicability garden hose reel replacement parts 15mm diameter hole in the middle, consisted of 2 half circles and connecting with screws and nut. Fit for 3/8inch hose reel and hose with 15mm outer diameter The stopper can be adjusted and fixed in place which you want to stop when the hose reel roll back automatically. Bumpers allow the desired length of hose or cord to be permanently stored outside the reel, Manufacturer: Montesy