I have ball valves attached to thru hulls below the water line. The only identifying marks are the letters XL on the T-handles. The body of valve is black plastic or marelon, the T-handles are red, and there are blue circles in the center of T-handle. I tried searching the net to no avail. Anyone know what these valves are made of and whether they are acceptable below the waterline?
We're hauling the boat next month so I need to decide whether to replace them. Thanks.
Forespar’s “Marelon” is a proprietary glass-reinforced nylon plastic, and their Marelon Ball Valves/Sea Cocks etc. have been UL tested per ABYC standards.
Most, (if not all - I know of no other approved 'plastic' valve), other “plastic” ball valves are entirely unsuitable for marine use. If you cannot identify it as "Marelon", replace it.
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Gord May "If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"
You'll note that the picture of the Forespar Marelon ball valve shown above has a blue circle with a sticker that says "RC." Other Forespar Marelon products that I've used have also been labeled "RC Marine."
I would go with Gord's advice. If you can't positively identify it as being Marelon (e.g. Forespar/RC Marine), then it is suspect.
Thanks for all the help on the ball valves. The boat was made in France (Privilege Cat) so the composition is unknown, but the valves look well made and operate easily. Since I don't want to even think about them on some "dark and stormy night", I think I'll follow Gord's advice and replace them.