There a bunch of threads about this...but here's one that has a link to the adapter that I bought. However, in hindsight, I'm not sure if I used the right one. The adapter I have is tapered (BSPT), but I don't remember if the hole in the block was tapered or not. Either way, the one I bought is working and hasn't leaked.Okay, I was just going to replace my stock one as well but it seems they’re different sizes. I’m assuming I can go pick up a threaded adapter for it?