What size oil filter do you use for your permacool (189) sandwich adapter? I have been using a PH16 which is shorter than a PH8A but I could really use something skinnier not so wide.
I will use the AA3600, or you can check out the 3614. Both are narrower 3/4's. I think I have 2 AA3600 back in Japan for my soon to begin sandwich/BP adventure.
