Our Solvent Joint Soil Systems are manufactured, as applicable, to the following British Standards BS 4514:1983: Specification for unplasticised PVC soil and ventilating pipes, fittings and accessories. BS EN 1451:2000: Plastic piping systems for soil and waste discharge within the building Structure-polypropylene. All component parts are manufactured under a quality management system registered under BS EN ISO 9001:2000. Available in Black & Olive Grey. Please note default colour is Black, to order Olive Grey please click on product and select Olive Grey from menu