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I believe the fittings you have are probably made by Whale and are for 15mm water line. All of those on my hull #930 are.

Whale Water Systems Inc.
100 Corporate Place,
Suite 402,
Peabody,
MA 01960, USA

Tel: 978-531-0021


Here's the web address for their catalog, you'll find the fittings on page 31.

www.whalepumps.com/docume..._nov06.pdf

Releasing the fittings is a whole lot easier than trying to describe how to do it, but I'll give it a go. There is a collar or ring that must be pressed in toward the fitting that releases the hose. Once pressed in to be flush with the fitting flange the hose will simply pull out. To reattach, press the hose firmly all the way into the fitting. It must go all the way in to cause the collar to 'pop' into place and lock it. After you've done one you'll see how easy it really is.

There are fittings around that are similar in appearance but they won't work with the Whale water hoses unless they're 15mm. My area home stores and marine stores had some things very much like the Whales but they were all for other sized hose, mostly 1/2'. Wouldn't work. Maybe there's a chandlery in your area that stocks the Whales or would order them for you.

I finally called Whale's US folks and found them very helpful. They even shipped me a replacement fitting free of charge. They also gave me the names of several mail order folks for future retail purchases. One being Fisheries Supply (www.fisheriessupply.com) though there were others.