It is possible to run up to three 2 pot modules from one single tank. A 2 Pot Extension Module is supplied complete with integral AQUAvalve, 1.5 metre length of irrigation tube and ‘T’ piece connector. The 2 pot extension module is manufactured from recycled polypropylene, while the AQUAvalve is manufactured in tough ABS. This will only work if you buy the Easy 2 Grow Starter Kit.