i got my 13" bags but i order 1/2" port but they sent me 3/8" port. I called the shop and he told me right now they're out of the 1/2" port ones but when he gets some in( sometime this week) he could send those out to me. Or he said i could just get a 1/2" line to 3/8 npt fitting and i wouldnt notice the difference. How much slower would it be if i kept the 3/8 port bag? Should i get him to send the 1/2 bag or just get another fitting?