"Caroflow Vertical Threaded outlets are available in four sizes, 50mm, 75mm, 100mm and 150mm. Each threaded outlet comes with a body(with thread), clamping ring and grating assembly (domical or flat). The outlets are female threaded to BS21:1985. All Caroflow Vertical Threaded outlets are suitable for connection to, Screw Threaded Steel, Copper (Gunmetal only), PVC, Aluminium and Cast Iron. The PVC, Aluminium and Cast Iron connections are all suitable with the Caroflow Threaded Adaptor. The standard length of our Threaded Adaptor is 300mm, although other lengths can be produced to order.