Woody,

Id be interested in seeing a drawing of how you do that (I assume you just switch the inlet/outlet pipes round on one side). One of the big problems on Hydra is flow. Plenty of big pipes but lots of small orofice fittings, lots of T pieces, elbows and stuff. All seems to mean gas delivery is actually quite poor (12mm pipe into a 1/4 fitting means you get the flow through the 1/4 fitting and nowt more).

Andy