I have Moen 87560 (I believe) Single lever, pull out sprayer. It started leaking at the base. I replaced the cartridge. After further review it still is leaking from the back side of the faucet. I have done some searching on the Internet and found that a Vaccum breaker may be the cause. Using a mirror I see a plastic threaded peice with a rubber insert. I have been unable to locate that particular replacement part. Is that part defective or may there be another problem. Thanks for your help.
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