Not really... Those are meant to push in to a larger John Guest style fitting (it's a JG to JG adapter).
What you want is a reducing bushing in the case of a nonthreaded bulkhead - slip (to fit inside the bulkhead, and you have to cement them together same as for any other PVC connections) to threaded (that you then thread the JG-to-threaded adapter into).
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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