Gaggia OPV Mod

Yeah I'm confused about sizes, it appears people are stepping down form 3/8 to 1/8 but I'm unsure why if you can get a direct attachment? Presumably I just need some PTFE tape to seal it up?
I've only just looked so don't take my word for it having said that it won't look pretty but I don't think there is a huge amount of thread on the filter but with enough PTFE you should be okay screwing it straight on.

Phil's suggestion is obviously built for the job then again you'll probably only use it once. If know anyone with a engine compression tester you'd only require a coupling.
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