Home DIY

I have two water troughs and I'd like to connect them so that water that collects in one will overflow and fill the other (downpipe will fill the first from the rainwater off the roof). This water can then be stored and used on the garden.

The easy way to do this would be to use a normal tank fitting and connect the tanks at the bottom ... but:

1. it's easier to use the water if only one tank fills first so the overflow needs to be nearer the top (easy)
   
2. the design committee are insisting on an internal overflow pipe that's open at the high water point which is then routed down internally within the tank before exiting at the bottom (more complicated)
   
   

Does such a thing as a double sided tank/bulkhead fitting exist, ideally with 15mm compression joints to conect pipe to? Most tank fittings are understandibly single sided, I could probably figure something out with a threaded tank fitting and compression adaptor but if a single fitting exists that would do the job I think that would be better.