These are available in both 60 and 80 mm diameter. 80 mm Diameter Available in lengths of 0.25, 0.5 & 1.0 Metre lengths, both male/male and male/female. In the female connections there is a position to fit an ‘O’ ring seal. 60 mm Diameter Available in lengths of 0.6 and 1.0 metre, with the same connection characteristics as the 80mm version. All versions are available painted or unpainted.