Complete Isolation Manifold for 80cf 11.1 litre Cylinders (186 mm Dirzone M18 X 1.5 300 Bar Monovalve Diveinn DIRZone Isolation Manifold 300 Bar for 140 mm Double Set, Centre Part only What are isolation manifolds? Blue Grotto Dive Resort COMPLETE MANIFOLD FOR TWIN SET 300 BAR 204 MM. Can be used to assemble a complete manifold with our extendable valves left right, 230 300bar. For use with tanks with 140mm diameter (7l, 8l, 8,5l).