The Aladdin Easy Fit Self Cutting Isolation Valve 15mm Starter Pack is a set of four stop valves designed for plumbing and heating systems. Made from a combination of stainless steel and brass, these valves are durable and resistant to corrosion. The self-cutting feature makes installation quick and easy, without the need for additional tools. Perfect for DIY enthusiasts or professional plumbers, this starter pack provides everything needed to effectively isolate sections of the system for maintenance or repairs.