I recently installed a new shutoff under my sink and it has a 3/8
compression fitting for my dishwasher. I want to cap off the fitting
until my dishwasher gets here.
The problem is I can't get the cap to seal. I purchased a 3/8
compression cap and applied teflon paste to the 3/8 outlet on the
Am I missing something? The guy at menards confirmed that I can use a
compression cap to seal off the outlet. Is he wrong?
Thanks for the help!
Why not just shutoff the valve until the dishwasher gets there? Unless
you only have one shutoff for the faucet and dishwasher, in which case
I'd add another valve. The more knowledgeable plumbers may disagree,
but you can never have enough shutoffs. I'v only been in my current
house about 6 months and have already add/replaced 8 of them.
No I didn't. I specifically asked the guy at Menards and he said I
wasn't supposed to use one (one did not come with the cap). Are you
certain it is required? I hope so, because that would solve my
Thanks for the help!!!
Ben wrote: Did you put the ferrule inside the cap before you installed
it? if not
that's whats causing the leak...good luck.
If it's really a "cap" it won't need a ferrule. Try some teflon tape
over the paste, and don't overtighten. Tom
The cap does not have a rubber gasket. What bothers me is that nothing
else came in the package. The package said 3/8 compression cap. It is
the same thread as the compression outlet on the shutoff. Should I
just keep tighting it down? I better judgement tells me that is not a
I've put several of those caps on unused fittings around here. All of
them have rubber gaskets inside, such that the gasket will compress
between the cap and the end of the outlet. The gasket is just a simple
rubber disk that fits inside the cap.
Currently I have four in use, purchased at two different times. I think
all from Home Depot, but it is entirely possible a pair came from Ace
Hardware. Ace Hardware also sells rubber sheets (about 5x7in) in a bag
which are intended to make gaskets. I would make a gasket rather than
continue cranking down on the cap.
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