... 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 example, grey, ... is very novel and be popular for many people.Technical characteristics:1)Easy to install, easy to operate2 ... for at least 10 yearsApplication: applies to Swimming pool, wastewater treatment, aquaculture, agriculture, irrigation, industrialapplications, etc. to the drainage system. 1/2 ...