Hydrostatically tested to 1.5 times maximum working pressure. Has trace code on body with material certificates available for all wetted parts on request. Various end connections available-NPT-BSP-BSPT-etc. Can be supplied to NACE MR-01-75-Latest edition. Corrosion resistant spring for long life. Non return valve, available in 6000 psi and 10000 psi versions. Soft seat for bubble tight close. Seal Materials:- Viton (Standard) (Other options available see chart). Large thru bore for max flow and low pressure drop.