bids are invited for spiral and with ss 316l inner rings bb gasket for 4inch x 300psi toa make dd valve gasket size 195x170x4.5 mm thk , bb gasket for 6inch x 300psi toa make dd valve gasket size 255 x 230 x 4.5 mm thk , bb gasket for 12inch x 300psi toa make dd valve gasket size 383x351x4.5 mm thk , bb gasket for 14inch x 300psi toa make dd valve gasket size 453 x 413 x 4.5 mm thk , bb gasket for 4inch x 300psi audco make dd valve gasket size 193x174.5x4.5 mm thk , bb gasket for 6inch x 300psi audco make dd valve gasket size 225.5 x 247.4 x 4.5 mm thk , bb gasket for 8inch and 10inch x300psi audco make dd valve gasket size 319.5 x 296.2 x 4.5 mm thk. , bb gasket for 8inch x 400psi audco make dd valve gasket size 326.6 x 303.3 x 4.5 mm thk. , bb gasket for darling make dd valve size 1 1by2inch and 2 inch x 300psi size 108 x 92 x 4.5 mm thk , bb gasket for darling make dd valve size 3 inch x 300psi gasket size 157 x 140 x 4.5 mm thk. , bb gasket for darling make dd valve size 6 inch x 300psi size 261.7 x 239.7 x 4.5 mm thk. , bb gasket for darling make dd valve size 8 inch x 300psi by 10inch x 300psi, size 299.5x274.5x4.5 mm thk , bb gasket for darling make dd valve size 14 inch x 300psi gasket size 414 x 389 x 4.5 mm thk. , bb gasket for darling make dd valve valve size 16 inch x 300psi gasket size 488 x 462 x 4.5 mm thk. , bb gasket for darling make dd valve size 30 inch x 300psi gasket size 770x738x4.5 mm thk , bb gasket for darling make dd valve size 36 inch x 300psi gasket size 948.6 x 912 x 4.5 mm thk. , bb gasket for koso make dd valve size 16 inch x 300psi gasket size 567x537x518x4.5 mm thk , sealant adopter isolation valve gasket size 36 x 28 x 4.5 mm thk. , sealant adopter gasket up to 10inch dd valves gasket size 69.9 x 54.1 x 4.5 mm thk. , sealant 1 40valves gasket size 69.9 x 54.1 x 4.5 mm thk. , sealant 523 x 480 x 6.0 mm thk. , bb gasket for fouress make nrv size 4inch x 300psi gasket size 218 x190 x 4.5 mm thk. , bb gasket for audco make gate valve si