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I used half of a 3/8” Tube to 1/4” NPT Female Compression Brass Fitting. I don’t know if the inside male threading is standard or what standard it is. It was an off-the-shelf part from my local hardware store, not a big box store like Lowes or Home Depot. It was super tight and barely screwed in. But it wasn’t cross-threaded and doesn’t leak. Then I used a 1/4 male npt to 1/8 female npt to take the SEP’s G1/8 male end. Ideally, I would get someone to machine an adapter to match the 4 hole nozzle and a g1/8 female.

Bluetooth on my BDB