DIYer

[QUOTE=Trichy Bastard;6464175]
I had the same issue you are having. I was able to fit a regular PVC (it's actually the same as NPT) 3/8 male to 1/2 female threaded reducing bushing in the Accumulator which now sizes the accumulator output to 1/2 NPT female. After that I purchased a 1/2 npt male to 1/2" JG male stem piece then I used a 1/2 J/G to 1/4" jG reducing adaptor to size it down once more.

The pvc adaptor I just mentioned is located at any hardware store (standard schedule 40)- and I remember tree farmer writing that his leaked, but he switched to a schedule 80 adaptor and it stopped leaking- it looks like this: http://www.grainger.com/Grainger/GF-...-Bushing-6MZ88.
And these 2 parts complete the transition:
http://www.freshwatersystems.com/p-1...-x-12-npt.aspx (1/2 NPT male to 1/2 JG male)
http://www.freshwatersystems.com/p-1...s-x-14-od.aspx (its 9 bucks, and the pic doesn't show the back side, but it is a 1/2 JG female to 1/4 JG female). These 3 mentioned parts will take the output of the accumulator down to 1/4" JG/PEX ready to pop your line into it.