Gray Water drain question

[danscanjr]

Saturday I anchored in beautiful Lake St Clair, in shallow water. As I walked around my boat, I noticed that the fitting where my bathroom sink drains out was missing. It is about 1 ft above the waterline. (28' cruiser, Larson)

When I got back to the marina, I opened up the cabinet and found the sink's drain hose, hanging free, with the plastic (inside) fitting that had been attached to the hull and the outside fitting.

I think I know what part to get- its a 1" 'mushroom' shaped outside fitting that will screw onto the inside fitting. My question- what should I use to seal it?

 

[Radioactive]

3M 4200.

No need for the more "permanent", below the waterline sealants sealants such as 5200 or 3M 101, as the fitting is above the waterline.

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btw: I hate the plastic fittings. They tend to crack and fail... When I upgraded the boat, I used bronze ( below ) and S/S ( above ).

 

[PascalG]

lucky for you the thuhull is higher up... many builders put them close to the water line to minimize dirt streaks, that's a recipe for disaster!

check the other ones, if one cracked, the others may crack too, usually due to UV, overtightening or poorly supported hose.

replace it with a SS fitting, with 4200.

 

[danscanjr]

Thanks guys, I appreciate it. One more question- when searching for the fitting, what dimension does the listed size refer to? Is it the inner diameter of the hose?

Dan

 

[Vic Willman]

Yes, a 3/4" through hull fitting, as an example, is supposed to have a 3/4" I.D. hose connected to it. They are all sized based on the hose I.D.