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All I can say is it worked, it threaded on very easily, it does not leak, and it's not cross-threaded. I do think it's disappointingly low-quality fabrication work on a $2000 heater that something as simple as a union won't marry up smoothly. It doesn't do a lot for my confidence in the quality...

GOT IT! Gloves are recommended. Standard precautions for hot water or cooking should be followed. 1. Keep the header as cool as possible. Cold, wet rags or even ice packs placed on the header are a good way to go, especially if it's a hot day or if the sun is shining directly on the black...

New nuts are the exact same size as the old ones. These should be 3 1/2" 8UN thread. That would be a thread with a minor internal diameter(nut) of 3.3647" and minor external diameter(bolt) of 3.3512." First a disclaimer, I work in steels and sometimes aluminum. My tools don't really allow me...

Upon closer inspection, the threads on the header are "cut-in" from being cross-threaded previously. It is on the bottom-side where I couldn't see until I laid on the ground to look after feeling something that wasn't right. No wonder why that nut was on there so tight. Gotta love running right...

It's a Hayward heater. Model number is H400IDL. Roughly 3" diameter nut for Hayward's 2" PVC union that mates up to the heater's header/manifold. At this point, I'm hoping that the threads on the header are still ok. Replacing the header looks like a couple hours of not fun work.

After checking with a dial caliper, the nut is out of round by 0.06 inches. It's slightly oval-shaped. How does that happen? In any case, the only show in town (Leslie's) doesn't have one in stock. Tried calling to check before going over there, but no answer. Walked in the door, and found out...

Disassembled the unions on my Hayward H400 to replace the o-rings since one was leaking. Outlet union nut went on fine. Inlet won't thread on. It keeps jumping off on one side or the other, resulting in a crossthreaded connection. Anyone ever had either the header or the nut go out of round...

I'm not even going to find out. Doing a flush. Water is much cheaper than a salt cell or a controller. I'm shooting to bring it down to 3300-3700. Recommended upper limit as per the manual is 3300. I think it must have a high cutout, since I have found the low cutout. I don't think 500(15%)...

Replied too quick. Hah. Was editing the original post to say cell is pretty clean. Was hoping I was wrong. There goes some beer money. :p Thanks for the quick reply!

Relatively new pool owner, existing ~5 yr old plaster 10k gal pool. Think my salt cell(original install) is dying, but want a 2nd opinion/sanity check. Goldline controls, T-15 cell. Inside control panel and circuit board looks brand new. Fuses good, no discoloration/burns. Pulled and cleaned the...