AS-Schneider Direct Mount 3 Valve Manifolds (Traditional Style) are designed for direct mounting to Differential Pressure Transmitters with standard flange connection in accordance with DIN EN 61518 / IEC 61518. The standard 3 valve manifold type H3A has no vent connections. Pipe plugs are installed as standard at the H3B type with vent connection 1/4 NPT female. Accessory kits incl. washers are required for manifold to transmitter mounting, because the manifolds are provided with slotted bolt holes.