This should be an easy Delta question for you guys!

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TRex22

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About that "dome nut"...

A "really" good plumber would probably be able to replace the valve from the front, but he would also be able to remove the "dome nut" without cutting it or damaging the copper tubes holding the faucet together. The copper tubes are NOT "work hardened" and they WILL twist off very easily if you abuse the faucet body.

I have this exact same fixture and had a terrible time removing it today. Funny how all the "Do it Yourself" videos don't demonstrate using real-world parts with 20 years of corrosion and calcium deposits. Anyway...

I tried whacking on the dome nut, whacking on the pliers, whacking me head against the wall - nothing would get the thing loose. I used some WD-40 (which actually doesn't make a whole lot of sense for this particular type of issue) with negative results. Two hours of frustration and counting. Meanwhile the water to my house is shut off. Ugh. THEN...

I found some "Lime-Away", which is a similar product to CLR or other hard water deposit removal sprays. I blasted the assembly with it, making sure it got into the crevise behind the dome nut. I let it soak for probably 3-4 minutes, and then tried the pliers again. POP! It came loose immediately with only moderate effort. *HIGHLY* recommend you try this method first if you can't get the dome nut off.

Best wishes,

TR
 
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