Quick & Easy to Install, 30m Pack (10 x 3m)., Push-Fit Ring Seal System, Manufactured to BS EN 1451-1: 2000 / BS 5254, Allows 10mm Expansion Gap, No Solvent Welding or Tightening Required, Made from polypropylene, this is a quick & easy way to install waste systems incorporating a push-fit ring seal system., An allowance of a 10mm expansion gap on all push-fit joints is required., The 10mm expansion gap is needed for the expansion of pipes & fittings in each socket of push-fit systems.