GK-01 Hydraulic Nitrogen Pressure Gauge Test Kit, Nitrogen Accumulator Gas Charging Tools, Nitrogen Inflation Kit, 0-400 BAR/6000 PSI, w/ 7 Couplings, 3 Pressure Gauges 1 Gas Hose, 1 Main Valve Body

Dont buy it, just don't.Where to begin, firstly we are a machine shop who make parts with tight tolerances ( im the maintenance guy) so I would like to think I know what I'm talking about. This thing is JUNK. At first glance it looks ok but when you try to use it youll quickly realize why it was half price compared to the good ones. The gauges it comes with are interesting to say the least, the threads are so tight itll screw in a few turns then lock up.All 3 gauges in the kit had this issue, its like the female side was cut a few tenths undersize making everything lock up, its also a weird thread pitch. In an entire machine shop with a dozen CNC machines at a company that makes valves for a living I couldnt find the right size tap to chase the threads. I ended up oiling the threads and working it in and out a quarter turn at a time until it finally seated.Wonderful! I can finally use it, it was a little annoying with the thread situation but its now useable right? NOPE. Issue number 2. I got my accumulator all screwed on, hooked up to the nitrogen and ready to charge. I wanted to put low pressure in it to seat the bladder so I cracked the valve a little and put a little charge in the accumulator. I closed all the valves and the gauge reads 500 PSI after closing the tank and valve to fill the accumulator. I figured I may have trapped some nitrogen but nope. Even after physically disconnecting the gauge it reads 500lbs. No big deal, were a valve shop with thousands of gauges on the shelf but remember that tap nobody could find? Yeah, good luck finding a gauge with that thread pitch locally.Ive never returned anything to amazon before but this will be the first!junk JUNK JUNK