One of the design issues we were supposed to run into was reconciling the 1/4"-19 BSPP male threading on the outlet of the katadyn filter element with whatever plumbing we were using downstream from that. But when I finally had the filter (shown in pink) in my hands I realized that 1/4" NPT threads are only one thread per inch less than BSPP(British Standard Pipe Psomethingorother) so over the thickness of 1/2" there should be little conflict. I tapped out a random scrap of delrin i had lying around with 1/4" NPT and it slid all the way down that chromed bitch like i'd been eating it out for hours already. Effortlessly. So never mind the headache of trying to do things right! For fuck's sake, already! Just to be sure, I tapped out the endcap for the filter outlet just a little(3/16") ways into the plastic, then notched the actual outlet piece in question so that it would tap itself the rest of the way through. It was pretty damn sharp and even after filing the makeshift teeth down, once the job was done, it still takes off some material every time it screws in.
