I looked them up on Amazon and they are located in Phoenix,these valves are probably imported from China and assembled here into the assemblies. The reason the Prince valve is $900 is the American labor to make the parts here. Last I looked most vendors were out of stock on the Prince valves,maybe they only tool up once a year to make those dual stick valves, or the covid shut them down hard,dont know on that..
the Summit valves might be a economical price alternative,never laid hands on one yet-look at fit and finish of the threads-and if equipped the NPT or JIC tapers quality FWIW
Happy Holidays to all
