Need help with KF25 to GL18 adapter

Hey guys I was wondering if these two adapters are the same and will fit a gl18 cold trap. I just want to connect a bellow hose straight from my vacuum.

https://www.amazon.com/Adapter-PT-Female-ISO-KF-Flange-Stainless/dp/B07RJ2DLJ7/ref=sr_1_3?keywords=kf25+to+3%2F8&qid=1571234755&sr=8-3

I just find it so hard to spend that much on ONE adapter from lab society. anyways let me know guys y’all are awesome btw!

not the same.

even if the 3/8 threads match the g-18, which they don’t because “pipe thread” is tapered, you don’t want to try treading stainless onto glass.

talk to @david

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Gl 18 means 18 mm “semi” acme thread.

If you are using a hose setup a Bellow won’t help anywhere. You are limited to the gl18 connection.

Convert it all to hard pipe and then go Bellow at end of glass.

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is the solution to toss the glass or have it altered?