I measured the end of the hose which I use for this and it is 3/4 inch. I'm not sure if that is stretched just a little bit (kind of appears so) from so many times getting hooked onto the 2262 valve. but I keep a little clamp on mine, which I can slip up and tighten with a screw while draining. I put a dab of Pam spray inside to make the hose slip on without me forcing or jiggling the valve, just so I don't get too rough.Anyone know what diamter hose i need ?