bids are invited for one forth inch nptm x 6 mm - od tube male connector , one forthinch nptf x 6mm - od tube female connector , 6 mm od tube x 6 mm od tube - straight connector , one forth inch nptm x 6 mm - od tube male elbow connector , half inch nptm x 12 mm - od tube male connector ss , half npt - inch nptod tube mm , half inchnptmx 8mm - od tube male connector ss , half inchnpt f x 8 mm - od tube female connector ss , three by eight inch nptmx 6 mm - od tube , three by eight inch nptfx 6 mm - od tube , three by eight inch nptm x 8 mm - od tube , three by eight inch nptf x 8 mm - od tube , 12 mm x 12mm - od tube straight connector ss , 1 inch nptmx 6 mm - od tube male connector ss total quantity : 555