... , new material of PVC2)Size: 1/2'',3/4'',1'',1--1/2'',2'',3'',3--1/2'',4''3)Many color available you can choice ... , lightweight.3)The fluid resistance is small.4)No vibration, and no noise.5)Each valve is pressure tested at the end ... after the factory, Lowest leakage rate.6)Quality: Heat, high ...