Interesting tyre compressor info

Hi all, I have a high flow Iron Man compressor that I bought back in 2018. A year ago I bought a set of Indeflate lines to inflate all 4 tyres at the same time. Well .. slow as a wet weekend. Took nearly 20 minutes for all four from 18psi to 40psi. Today I got around to finding out why. There was a single schraeder valve attached to the gauge end. Took it off to find the exit hole in the fitting after the schraeder valve measured 2mm !!!!! Seriously WTF. Took that out, installed a 8mm check valve with few feet of air line and a nitto fitting to the compressor. Tried again ... 6 minutes 52 seconds for all 4 tyres from 18 to 40 psi !!!!!!! Why they made it like that I do not know. But if your having slow inflation .. check the fittings. Dunno if that was just mine but it's absurd .. :D