1. ISO 9001 certificate 2. Material: J55, K55, N80, L80 3.Buckle type: LTC/STC/PDC/BTC 4.Size: 5 1/2"-20". Features: 1) All inner parts are made of easily drillable aluminum alloy 2) The device can be connected directly to same type casing 3) Reliable back-pressure leak proof structure, enable grout or slurry flow with less resistance 4) Valve seat and valve disk can effectively prevent grout from flowing back 5) Hardness of base material is equivalent to API Spec N-80. Wooden case or as per buyer's requirements.
