This solvent weld boss adaptor is used in conjunction with either an SP583 Short Boss Pipe, an SP581 boss pipe or an SP319 strap boss to connect a waste pipe into a 110mm soil pipe. It can also be used inside the boss shoulders of other fittings such as junctions. The boss adaptor is solvent welded into the circular opening in a boss fitting. The waste pipe is then glued inside the boss pipe to give a permanent fit. Use solvent weld SC250 for all solvent weld joints. Note - solvent weld joints cannot be taken apart once the joint has been made. If you have not used boss fittings before we would suggest watching our  short instructional video detailing how to use the various boss fittings that are available.