[MikeAurelius]

Basically, what you are going to need is a size reducer from the pipe or valve end to 1/4" NPT. The welding shop, if they don't have the NPT to B fitting should be able to get one for you -- if you are having problems finding them, my place stocks them, and I can get one for you either Saturday or on Monday and overnight it to you - to have on Tuesday.

If there is a male pipe thread (for example a male 1/2" pipe), you will need a size reducer of the same material (black pipe or stainless for example) to 1/4", typically they look like a tube that's been compressed and it will have a 1/2" female thread on one side and a 1/4" female thread on the other side. Once you have the NPT to B adapter, put either teflon tape or pipe compound on the threads of the NPT to B adapter and the male pipe threads. Thread the NPT to B adapter into the size reducer, then screw the size reducer onto the male pipe thread. Use a proper sized wrench on the NPT to B adapter and tighten the adapter into the size reducer. Both will turn while you do this - that's OK. Keep on tightening until both the adapter and the size reducer stop turning. Then mount the red hose to the adapter and tighten.

If you have a female thread (for example, the open end of the valve), you will need (for example) a male ended 1/2" NPT thread size reducer to a 1/4" female NPT thread. This size reducer has a large outside diameter threaded to match the female thread on the valve and a threaded hole to match the 1/4" NPT to B adapter. Use teflon tape or pipe compound as above always on the male portions of the thread, and mount and tighten as above.