Red and blue pair – provides one valve for each primary manifold connection Flow and return identification – colour-coded handles distinguish the two sides 1″ manifold connection – designed for compatible primary manifold outlets 413 Series compatibility – specified for Ambiente manifolds with 413 product codes Manual manifold isolation – separates the manifold from the primary heating circuit Commissioning support – allows the primary connections to be shut when required Maintenance access – assists with suitable servicing and component replacement Non-gauged option – provides isolation without integrated temperature indicators