1999 268 sink valve thread size.

efx

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Does anyone know what thread size these balances are from 1999? The scandvik hose fits the sink / shower wand and has a 3/8 female. I have. A 3/8 male coupler but it seams big for this female valve connection. image.jpg
 

Hookup1

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I'm no plumbing expert but I have had issues with straight threads and tapered pipe threads. To connect to a straight thread you need a coupling with a flat washer - like a garden hose - to seal to the pipe. That white fitting may be intended for a tapered thread. Get a piece of pipe from Home Depot and see if it fits better. While yo are there look at the braided stainless hoses for sinks and toilets. There may be a mate for the faucet that can adapt straight to tapered. I have this problem with baitwell pumps not properly screwing into thru hulls.