The McAlpine ST70SS85 is a shower trap and waste fitting that is used in plumbing installations to trap and remove wastewater from a shower unit. The ST70SS85 features a 70mm water seal trap and an 85mm diameter waste outlet, making it suitable for use with most standard shower units. The trap is designed to prevent foul odours from entering the room by retaining a small amount of water in the trap. The ST70SS85 is made from high-quality materials, ensuring its durability and longevity. The trap also features a removable grid, which allows for easy cleaning and maintenance. Overall, the McAlpine ST70SS85 70mm shower trap and 85mm waste fitting is a specific plumbing fitting that is used to trap and remove wastewater from a shower unit. Its high-quality materials and removable grid make it a durable and easy-to-maintain option for many plumbing applications.