In case you don't know of them, McMaster-Carr (www.mcmaster.com) is a superb source for hardware of all kinds and great folks as well. I bought a couple of pressure gauges to monitor water pressure in the house when I had to replace a bad pressure regulator; i.e. one gauge on the inflow side and one on the outflow. After a couple of years I found both pressure gauges to be half full of water -- a very bad sign. I asked the folks at McMaster about this and they agreed that these gauges should last much longer than that. Then they looked up my order and from two years back and refunded my money! How good is that!