1.material:pvc ball lvalve 2.Size:1/2''--4'' 3.Standard: BSPT,ANSI, ... resistance is small.6)No vibration, and no noise.7Each valve is pressure tested at the end after the factory, Lowest ... long usage life for at least 10 years.ApplicationApply to swimming pool, wastewater treatment, agriculture irrigation, industrial applications, etc pvc check ball valve