This cap, strap and spout is the original replacement for most gravity style fresh water fills. Cap has a tab style, non-threaded type twist lock to assure a good seal to your water fill. Strap is heavy duty plastic which holds up to the UV rays and weather better than most rubber styles. Spout is barbed for easy replacement and will accept either 1-1/4" or 1-3/8" water fill hose. Hose clamps are recommended for this replacement.