This is the $13 gauge on Amazon that I recommend. The knurled textured QD coupler is sturdier than the other charging hoses with the smooth rimmed coupler.Thanks all, really helpful advice. No stop leak additive it is and I think I'll order an amazon refill hose with gauge for $13 and a $10 can of R123a from walmart. I do have actual gauges somewhere but they are very old.