I need to replace a pair of water shut off valves soldered onto 1/2 inch copper pipe where it's not feasible to use ball valves, and I want to know what the plumbing gurus in here think is the best non-ball valve available that can be soldered onto 1/2 inch copper pipe. The last time I needed to do this, I used a pair of KITZ gate valves (KITZ #28 gate valves actually). The problem is that I can't shut the water off completely with them (there is always a very slow drip) and I was told that I must have mixed up or turned around the gates. (I took the bonnets and gates out of the valves, soldered the valve bodies in, and put the gates and bonnets back in, and apparantly you can't do that without running the risk of mixing up the gates or turning them around so the valve won't close 100% after that. Also, I can't order parts (like a new packing for these KITZ gate valves because the guy selling them tells me it's cheaper to replace the valve than to get a packing for it. If you think you know your stuff, what is the best non-ball valve that can be soldered onto a 1/2 inch copper pipe, and why do you like it?