The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.
Does this look ok?? Just got the boat. Sink wouldn’t drain so I started poking around. The faucet knob on the left just kinda turns and doesn’t do anything. I plan to delete the cooler drain alltogether. I think I need to address this while the boat is out of the water. Help!!
Is this the seacock near the galley? There are two lines that drain here:  the galley sink, and  the ice chest cooler. If you use the galley cooler and load it up with ice, the ice will melt and water will run down the drain. The original setup allowed water from the galley sink drain to backup into the cooler, so there was a cheap check valve in line on the cooler to prevent this from happening. Also, because the cooler is so deep, if the boat is on a heel, seawater was able to drain back into the cooler. So much for your ice! I decided to stop using the cooler altogether: I store pots and pans in there. I disconnected the hose and plugged the end. Then I ran a straight run to the through hull from the galley sink. I bought a much more efficient and more easily accessible 3-1/2 day cooler that doesn’t need to drip ice water anywhere. There is a raised floor in the new cooler where the water goes. My meats, cheeses and veggies stay dry, and never swim in the meltwater.
Oh, answering your actual question. Early through hulls we’re called volcano types seacocks. In a 40-year-old boat they are very brittle and fragile. If you’re still in the water, just leave it the heck alone. It could easily just bust off and flood your boat. Wait until you haul out, then bust it off. Don Casey’s book on repairing old sailboats (which you should be able to borrow from your public library) will describe how to replace a through hull fitting the safe way.
Leon's right (as always)--it's NOT OK! If you use Search looking for "to-hull" in the C-25 forum (including archives), you'll get pages of discussions about this subject--at least one by Bill Holcomb, one of our top C-25 gurus. Some stories include descriptions of how the bronze pipe, held just by its threads in the epoxy "volcano", crumbled in their hands. Some include discussions of adding backing plates for the new thru-hull, using something like HDPE ($tarbard or a cheap cutting board from Walmart). Many have photos...
Good on you for spotting this early! Fortunately, starting around 1984 or so, Catalina started using proper thru-hull fittings and ball valves--my 1985 had flush exterior disks that were countersunk into the hull (instead of "mushrooms")--overkill IMHO.
Dave Bristle Association "Port Captain" for Mystic/Stonington CT PO of 1985 C-25 SR/FK #5032 Passage, ex-OUPV, Now on Eastern 27 $+!nkp*+ Sarge
I posted a link in response to your query in the General Forum and summarized the procedure. The link was to an article by Bill Holcomb, who probably knows more about C25s than anyone outside of Catalina Yachts. He described replacing to hull fittings with thru fittings and ball valves. Sometimes I have to read an article like that 2-3 times before a light bulb comes on and I suddenly get it.
Steve Milby J/24 "Captiva Wind" previously C&C 35, Cal 25, C25 TR/FK, C22 Past Commodore
There are many articles written about gate valves (which your pictures show you have) vs proper seacocks as well as "too hull" vs "through hull" fittings. Catalina was not the only boat manufacturer to use both early on. ALL articles discuss the importance of replacing with properly installed seacocks. Catalina Direct have them at reasonable pricing. The project should be doable for you to handle over the winter.
Peter Bigelow C-25 TR/FK #2092 Limerick Rowayton, Ct Port Captain: Rowayton/Norwalk/Darien CT
Notice: The advice given on this site is based upon individual or quoted experience, yours may differ. The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.