Finned seal spigot for internal connection to 4"/110mm cast iron, plastic or clay. Ideal for low level connections. Includes a 1 1/2" Universal Vent Boss and a Blank Cap. This connector should only be fitted on ground floor due to a reduction in the internal outlet diameter of the boss pipe connector. Manufactured in Black Polypropylene. It fits a 4"/110mm Ø pipe to BS 4514 with an 'O' seal socket. The 'O' seal socket provides a watertight seal between the pipe and the connector. The 1½" universal pipe boss allows for a waste appliance or discharge pipe to be connected to the drain. The blanking cap can be used to seal off the pipe boss if it is not needed. The McAlpine DC1-BL-BO is made from durable materials and is designed to withstand the rigors of regular use. It is easy to install and can be used in a variety of applications. This drain connector is suitable for both commercial and residential use.