The Tub Outlet is designed to suit a range of water reticulation applications in the hydroponic and nursery industries. The outlet comes with a 13mm, 19mm or 25mm tail, together with an outlet screen and outlet extension. We also provide extensions and screens to allow you to choose your preferred overflow or flood depth by using multiple extensions. The 13mm barb fits into the tub fittings in the same way as the extensions and screens, but the barb allows you to connect irrigation fittings to the other side as well.