McAlpine Drain Connector 110mm Grey DC1-GR McAlpine Drain Connector 110mm DC1-GR in Grey. Ideal for low level connections. Comes with a 'O' seal socket. Manufactured in polypropylene. Conforms to BS 4514. Suits repair, maintenance and improvement work. This drain connector by Mc Alpine is to fit a 110mm (4 inch) pipe. With a push-fit fitting, it is ideal for low level connections. The connector comes with a finned seal spigot for internal connections to cast iron, plastic or pipework.