Connection for drain hose and washing machine drain outlet Compatible with drain outlets of 31, 32, and 37 mm. Hose insertion port inner diameter: 33.3mm I bought this at a home center and opened it once, but I couldn't install it in my washing machine's drain outlet, so I'm selling it. Due to the nature of the material, there are some black scuffs here and there, but it's in perfectly usable condition. Please consider if you don't mind.