Some of the 1946-1950 Spartans with slider windows had problems with the water draining from the window pan. The water would drain but not fast enough in a heavy rain. These kits are designed to allow the water to drain out of the window pan much faster. These are installed by drilling a ½ inch hole in the bottom of the window pan then installing the drain kit under the hole. Silicone sealer should be used between the drain flange and the window pan. The drain flange can be screwed or riveted to the bottom of the drain pan. Then another ½ inch hole needs to be drilled through bottom flange at floor for drain tube to exit outside of the trailer. This kit includes 1 drain flange, 1-48” drain hose and 1 stainless steel hose clamp.