I hate to disagree but I think that a 1GR can support more than 8psi for daily driven use. I wont kid you and say that I have done it. Because we have not been lucky enough to play with a 1GR yet. Yet!!!:biggrin: But if the 2/3RZ can survive at 15 to 20 psi daily driven, why cant the 1GR? I cant begin to think that the 1GR is not as well engineered as the 2/3RZ.