i've been using THIS Robinair 40288 Line Piercing Valve for 3/16", 1/4", 5/16", 3/8" OD Tubing for a few weeks, works great, needle doesn't bend like the water-maker saddle valves.
don't mean to hijack this thread, the DYI discussed here is so KISS and a lot cheaper than this $16+ [=$20] AC valve, thanks to everyone posting here
don't mean to hijack this thread, the DYI discussed here is so KISS and a lot cheaper than this $16+ [=$20] AC valve, thanks to everyone posting here