The Reliance RWC 22mm 330 Domestic Pressure Reducing Limiting Valve is a high-quality product designed for use in storage tank water heaters. With a brand name of Reliance, this valve is made of durable brass material and is suitable for indoor mounting locations. Known for its energy efficiency, this valve has a rating of A, making it a reliable choice for heating systems such as boilers. With a maximum pressure limit of 3 bars, this valve ensures that water pressure is reduced to safe levels for domestic use.