---Wras Approved Certification. This 22mm Double check valve is fully certified by Wras, ensuring compliance with UK water regulations. Its Wras approval reflects adherence to high standards of quality and safety, safeguarding public health. ---22mm Connection Size. Designed with a 22mm connection size, this valve is optimized for use in domestic plumbing and heating systems. Its precise dimensions facilitate easy installation, integration, and compatibility with standard pipework. ---Double Check Design. Featuring a Double check mechanism, this valve allows for a streamlined flow control, ensuring that water flows in one direction only. This helps prevent backflow and contamination, enhancing system hygiene and integrity. ---Robust Construction Material. Crafted from durable material brass, this valve offers long lasting performance.