Lochinvar Noble NKC-199 leak at pump connection

Le John

Hello all. What type of gasket does the grundfoss pump connections use. There is a leak on the inlet side side of the pump right at the threads. I’ve tightened the brass nut but it still leaks.

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Alan (California Radiant) Forbes

It's probably a flat, fiber gasket.

If you don't have a replacement handy, remove it and if it's in decent shape, coat it with a thin layer of teflon dope and replace it. Also check the mating surfaces of the pump and opposing flange to make sure they're smooth.

hot_rod

most likely a fiber washer They are a compression set material and not really reusable once they are compressed.

In a bind you could remove, dry and try a thin pipe dope coating

That looks like a composite body circulator so you don’t want to crank too hard on it

That also looks like the 1” size G thread I have used rubber water meter gaskets as a replacement. Find them at plumbing and Ace hardware

Or get a piece of gasket material from an auto part and use an Exacto knife to cut a new gasket. They have Fel-Pro fiber, or some red rubber material