Can you add a picture of the adapter in your pump? Someone please correct me if I am wrong, because I am in no way an expert, but the actual adapter that is screwed into the inlet side of the pump on most machines is 3/8 BSPP (into pump):1/4 BSPP (into hose). HOWEVER, it might be different on yours. I had a 3/8 BSPP : 3/8 BSPT on my machine. The T and P on those is Taper and Parallel. Taper is a friction fit with PTFE tape and Parallel uses an o-ring like your stainless hose fittings on a dishwasher, etc.. What I have found, as you can see with the stainless hose I reference below, is that an o-ring/washer connection onto an NPT fitting seals just fine so you should be ok using the adapter below. I say "should" because my setup is more convoluted and you do not want to go that way:)
There is an o-ring on the pump side of that adapter that does not come with the replacement adapter I speak of below. I was able to reuse my o-ring but if yours falls apart I do not actually know what size you need because I did not find the stick adapter on any espresso parts store. Another thing to watch out for is an adapter that is too long on the pump side or is NOT BSPP like this one,
http://www.mscdirect.com/product/details/60041597 . It DOES NOT WORK, does annyone want a couple of adapters?:)
Personally if I were to do it again I would buy this adapter, 3/8 BSPP : 1/2 MNPT (9007-06-08)
http://www.hydraulicsdirect.com/BSPP-to ... 1&CartID=0 . Why? Because you can find a BUNCH of hoses that are 1/2" FNPT (or FIP, Female Iron Pipe, which is basically the same thing) like this,
http://www.homedepot.com/p/BrassCraft-3 ... 068479-_-N .
One thing to watch out for is how much the hose sticks out of the bottom of the machine. If there are too many adapters on the pump the hose will need to have a 90 degree bend or it will hit the table it is sitting on.
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