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Inside shut off valve not working.

I had connected my garden hose to the outside tap to wash my car and I usually shut off the water from the outside tap and the inside shutoff valve (basement) after I am done. I noticed today that when I turn the dial closed (shutoff valve)the water was still going to the outside tap... Luckily the outside tap shuts off the water.

I just wanted to know what might be causing the problem with the inside shutoff valve and if I needed to replace it... How much would something like that cost if I had to call a Plumber? Has anyone else had this issue and fixed it by themselves? I have no plumbing experience... :-(

Re: Inside shut off valve not working.

Chances are all it needs is a new washer. Turn the main water supply off and take the valve apart by loosing the lower nut on the valve to remove the stem. Replace the washer then reassemble.

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