Not-so-fun waste pump out

[Maxumus2400]

So the pump out station at the marina has one of those general purpose rubber hose ends that you have to push into the waste port and that force is supposed to form a seal as you then open the valve on the hose to begin the vacuum.

It didn't work so well yesterday evening and needless to say I had to find a shower ASAP. Even my dog ran away from me.

I've heard there is a better way by getting an adapter that screws into your waste port, then allowing you to clamp the pump-out hose to that adapter.

Any idea where I could buy such a wonderful device?
I'd need it to fit my 2400 SE.

Thanks!

[Maxumus2400]

Of course right after I post this I'm able to find it.

Anybody know which would be the correct size?

http://tinyurl.com/6xboha