The Pushfit Waste Knuckle Bend 40mm (also known as a 90-degree tight elbow) is a compact directional fitting designed to turn a 40mm waste pipe run by a sharp 90-degree angle. Manufactured from high-impact polypropylene, this fitting is specifically engineered for tight, confined spaces where a standard long-radius or swept bend will not fit.
 
Equipped with factory-installed elastomeric rubber lip seals in its push-fit sockets, the knuckle bend enables a fast, dry connection onto standard 40mm push-fit plastic waste pipes without requiring solvent weld cement or special tools. The rubber ring-seal mechanism forms an immediate watertight joint while allowing the pipework to freely expand and contract with hot water discharge.
 
Ideal for tight undersink installations, bath panel cavities, and wall-chased pipe routing where space behind fixtures is minimal, this 40mm fitting is fully resistant to continuous hot water flow and standard household detergents. It provides professional plumbers and DIYers with a practical, space-saving jointing solution for complex waste layouts.
 
Pushfit Waste systems are highly adaptable and manufactured to BS EN 1329:2000. They are fully compatible with other systems.