[MikeK]

FWIW, Milton has a "V" series of air couplers specifically designed for HVLP guns. They are 1/4" thread, but instead of the 40 CFM rating of the standard 1/4 "M" they are rated 74 CFM, near double. Thats more than the 55 CFM rating of the 3/8 "M" series!

As an added bonus, the couplers also accept the old standard 1/4 M fittings so you don't need to change over all your shop male plugs, only those that need high CFM.

Here's a comparison picture I brazenly ripped from SkyMaster on our 'other sister', the Garage Journal. Note the big difference in the hole size of the old 1/4" Milton M on the right. I'm currently in the process of changing over to "V" myself. Be sure to use quality 3/8 hose.


Here's a top view of the M & V series. 30CFM vs 74CFM
Again, your old M males will fit the new V, but at the old flow rate.