The Coxreels 237-1 is a zinc plated steel hose guard for the spring driven reels with 1/4" I.D. 1/2" O.D. hoses, 3/8" I.D. 21/32" O.D. hoses, 1/4" twin line hoses, or 12/3 SJO cords, 16/3 SJO cords, or 10/3 SJO cords. This spring guard is resistant to corrosion and is used to prevent excessive wear & tear on the installed hose. Ground shipping only