Two-Way Threaded roof outlets are designed for the use at the intersection of horizontal and vertical surfaces, i.e. a balcony and parapet wall and can be used to drain off vertically or horizontally. Available in either LM6 Aluminum Silican casting alloy to BS1490:1970 for most roof finishes or in leaded gunmetal to BS1400:1985 for use with lead or copper-clad roofs or for connection to copper pipework. They are female parallel threaded to BS21:1985.