Our cast aluminium gutter lengths are a lightweight and traditonal styled alternative to our extruded aluminum guttering. This 1.8mtr length measures 125mm across the top and is made from a top quality aluminium alloy.When joining cast aluminium gutter lengths to unions and other fittings, the process must be completed by injecting ARPand#039;s unique 3923 sealant after said fittings have been clipped into position in order to ensure a secure fit.