HYDRANT COVER. #438YL A slip over hydrant cover was designed to identify fire hydrants that are out of service. Constructed of 22 oz. yellow vinyl with 4” letters stating “OUT OF SERVICE” on both sides, the cover is held in place with a 1” web strap with adjustable side release buckles around the bottom of the cover. It is available in yellow and weighs 32 oz. The dimensions are 30”W x 36”H, with a circumference of 60”.