New ones are about 10 bucks,unless you just need o ring.they simply unscrew from hose
SOURCE: moen kitchen faucet set wsprayer can't shut sprayer.
there is always water pressure on the sprayer when water is on. if sprayer is leaking check if trigger is stuck in . best to just change the sprayer handle it comes off at the base of the handle
SOURCE: Leaky faucet
Finding brand specific replacement parts in stock for a 20+ yo faucet without a Mod.# is quite the task, implying that you would have to do a side by side compareson/inspection. If in fact that part is not obsolete.
Maybe you should consider replacing the entire faucet.
Good luck
SOURCE: We have a Moen 87315C kitchen faucet and it is
If it's leaking at sprayer, and not the base where connected to hose, try this. Buy a bottle or jug of CLR. (calcium, lime, rust ) from hardware store, and pour enough in a bowl that will submerse sprayer in it. When you go to bed, or out for a few hours, turn off both taps (obviously) and relieve all pressure as well from sprayer. Now wrap an elastic around the handle of the sprayer so that lever is depressed, and submerse it in the bowl of CLR, and let it work overnight or at least for a few hours. Next Day, or Later, remove elastic from sprayer, and try it a few times and see if leak has stopped. Quite often you get calcium build up on internal washer/seal, and this will clean it off. If no CLR, you can try vinegar as well, but I find CLR better. If it appears better but not stopped completely, give it another treatment.
SOURCE: Moen kitchen sink faucet side sprayer is stuck on
The diverter valve in the faucet may be stuck or bad. This web site has some views of faucet internal parts. Hope this is helpful to you.
http://www.faucetdepot.com/prod/Moen-136102-Replacement-Hydrolock-(R)-Connection-27981.asp
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