FastPipe is 3/4" minimum. I'd have to transition from 1/2" Maxline to 1/2" NPT, then 1/2" NPT to FastPipe adaptor, then the length of Fastpipe, then an adaptor back to NPT. The cost of adaptors, plus 1 20' length of Fastpipe is more than the cost of a 100' roll of 1/2" Maxline.