Dvgw Wras Approval Liquid Sealing Gas Sealant Gas Pipes Fittings Pipe Sealing Cord Teflon Thread Tape US$0.60-1.50 / Piece 243 Medium Strength Glue for Adhesives Locks Nut Bolts US$1.20-2.00 / Piece Thread Locking Glue for Metal Nuts and Bolts Adhesive...