I'm setting up a new Waterbox Infinia 230.6 and the plumbing is all metric ~ 40 mm. Two of the biggest issues with the stock plumbing are with the drain pipe. The piece in the overflow is too short and needs to be longer so it doesnt sound like niagra falls. The piece that that runs into the sump is too long which makes it difficult to connect to a rollermat and ideally should have an elbow on the end so the hose to rollermat doesnt kink. I see that BRS and SaltwaterAquariums carry standard to metric couplings and unions but what if I am just looking for a 40 mm coupling i.e. metric only parts? I've been looking on the web with not much luck so if someone can recommend an online place to order from I would appreciate it.