I have this delta monitor either 1300 or 1400 that has a frozen bonnet I cannot remove. When I turn the retaining bonnet (with channel locks) , the entire shaft rotates. So I stopped. I tried using a pipe wrench on the shaft, and a channel locks on the bonnet, but it still wouldn’t budge. How do the pros remove this? Or is the entire shaft thread out??

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You can try a penetrating oil, or heating it, but you may end up slicing it off and getting a new nut.

Yeah, I used PB blaster already but it’s in pretty good. I thought about heating. But I’ll let a real plumber remove it.

Your plier marks look like they were “biting” at the 11:00 position. Try grabbing it with your pliers at a different position (8:00 or 9:00) and this time move your pliers as far back onto the shoulder of the nut as you can possibly get. The nut is thin and may be distorting as you torque it when the plier teeth are fully on it.

The bonnet/nut seems to be very heavy gauge so I can't see it bending but I'll try a different angle as perhaps you are right. I'm going back to customer today...I may try some more PB Blaster + lime-calcium-rust off + different angle + heat in that order and see if I can get it out. If I need to cut it...plumber time.

Can someone answer this: why does the longer shaft the nut sits on (the one that goes fully in and through the escutcheon plate and into the valve body) spin? Is it designed to spin off?



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No and usually when that happens the front of the valve disconnects from the back half, and then you have a whole different problem.

Customer decided to change out the whole valve body/trim. So no more frozen valve issue for me to resolve. But thanks to all for all the ideas!



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