Product features: - High performance stainless steel grab ring ensures superb joint integrity. - Demountable only by dis-assembling: Reduces potential for tampering.- One step operation: For quick and easy installation. - Suitable for use in hot and cold water and heating systems in domestic properties such as radiator and underfloor heating installations.- Suitable in both hard and soft water areas. - Not suitable for transportation of gases, not suitable for use on systems with a high concentration of Chlorine.- Material: Polybutylene. - Colour: Grey.- Please note: All PolyPlumb fittings are supplied with pre-lubricated EPDM 'O' rings. If for any reason further lubrication is required only Polypipe silicone lubricant should be used (purchased separately). Substances such as solder flux must not be used. - Caution: Do NOT insert fingers into the PolyPlumb fittings, as the grab ring is sharp and designed to grip.- Guarantee: Polypipe guarantees for 25 years against defects in materials or manufacture of the PolyPlumb hot and cold water supply and heating systems from the date purchased. This guarantee only applies if the products are installed in accordance with the manufacturers recommendations and are used in a normal domestic operation.