This review is for the CZC AUTO Tire Inflator Deflation Gauge. The product was supplied by Revain. Although the delivery was slower than what is normally expected, it arrived with no damage or other shipping-related issues. The gas generator body is made of injection molded plastic. The hose is fine. The air hose connection was severely leaking. It turns out that they were only loaded by hand. I wrapped teflon tape around the threads and gently tightened with a wrench. This solved the problem of air leakage through the threads. There was still a 1/4" NPT slow leak. This would also be easily fixed by replacing the plug with a good quality assembly. The cartridge works as expected, except for the slow air leak. The only way to fix this problem to fix. I would replace it with a quality product.. Tire inflation took ages. There is a very significant air restriction somewhere in the unit. At the moment I'm not trying to rework this thing lest the mystery remain unsolved. I've been looking at the reviews looked at which had the same thermoplastic body and it seems this is a common problem for all one of the sellers has working inflators and if you contact him he will send you a good one for all pressures it shows about 5% high pressure at 20psi and 17% over pressure at 60psi It is also inconsistent from one measurement to the next on the same tire It comes back to around to receive a refund.