... Good quality, 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, for ... .3)The fluid resistance is small.4)No vibration, and no noise.5)Each valve is pressure tested at ... least 10 yearsApplication: applies to Swimming pool, wastewater treatment, aquaculture, agriculture, irrigation, industrialapplications, etc. to the drainage system. 1/2-4 ...