This standard boss pipe is use in conjunction either with our SP10, SP11 and SP12 rubber boss adaptors or our SP20, SP21 andamp; SP22 solvent weld boss adaptors to introduce waste pipes into the soil stack. One of the openings on the boss pipe is already open, the others are blanked off and can be drilled out as required using a 54mm hole saw. This type of boss pipe has a ring seal push fit socket on the top end and a plain spigot end at the bottom. The spigot end is the same size as 110mm pipe so it can be connected into the socketed end of another fitting or pipe as required. You can also watch our short instructional video detailing how to use the various boss fittings that are available. The cast iron effect finish on this range has been developed over many years using a specially formulated paint process that cleverly mimics the metal products of yesteryear. It really does look like cast iron but with the maintenance free benefits of modern PVC. The ring seals joints are quick and easy to install, with oversized sockets and wide fixing lugs just like their original iron counterparts. The system, which carries a 20 year colour guarantee, is complemented by a large range of matching gutter products.