Quickly and easily reduces the diameter of a push-fit fitting black push-fit acetal reducer fitting reduces a push-fit connection port. Fast and simple to install, push-fit fittings create an instant push-fit connection and leak tight seal without the need for tools, hot works or sealing agents. The unique collet locking design firmly and securely holds the pipe in place without deforming the pipe or restricting flow. Fittings are corrosion resistant and fully demountable, improving system performance and reducing system downtime during maintenance. John Guest Push Fit 15mm to 12mm Reducer Fitting - Caravan/Motorhome in Black