What is this?

[rlaribee]

At the starboard aft corner in the cockpit of my new-to-me 1985 O'Day 28 there's a hose fitting. I thought it might be an outlet for a cockpit shower. I took the shower hose from the head, but it wouldn't fit. Different sizes. Does anyone know what this fitting is for, and if so, how do I use it / turn it on?

Thanks,
Rick

 

[fred1diver]

A picture would help

 

[Davidasailor26]

Does it have a black rubber diaphragm around it? If so, it’s not a hose fitting, it’s the diaphragm for the manual bilge pump. On our 28 it was mounted right where you describe. You should find an aluminum pipe, about 1’ long, with a black ball shape on the end. That pipe goes into the fitting, and you pump up and down to pump the bilge dry.

 

[LeslieTroyer]

If it’s female hose thread could be shore water input. Not to fill tanks but provide pressurized water while at shore. Good device for sinking your boat if left unattended.

 

[odaydokay]

My 28, same year, has no such thing. Take a photo so we don't have to guess ok? Sounds like an owner-installed accessory, though

 

[rlaribee]

Next time I'm down there I'll take a photo. My apologies for not providing one before.
I know it's not the manual bilge pump, as that's installed a few inches away. However, I think Leslie might be right! Shore water inlet not to refill the tanks, but to provide fresh water at the dock. THAT makes complete sense. But I'll confirm.