The Polypipe WP16W Knuckle Bend 40mm, 90° is a high-quality ABS waste fitting designed to facilitate smooth directional changes in domestic and commercial drainage systems. Its 90-degree knuckle bend allows pipes to navigate corners easily while ensuring a secure, leak-free connection with solvent welding. Ideal for bathrooms, kitchens, and utility areas, this 40mm fitting provides long-lasting durability and reliable performance for professional plumbing projects and DIY installations.