Well, I won't be using them after all. When I got the quick disconnects, they were HUGE! I vastly underestimated their size, not to mention their weight (about 1 kilogram with the two parts coupled)! I'll return them tomorrow. Oh well, so much for that plan

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Thanks for the replies!
By the way, if anybody knows a place where they sell plastic quick disconnects, then please let me know. Thanks a bunch!