b) Each type of valve and accessory is given separately. Diameters, dimensions and details are stated in descriptions, where necessary, to identify the work. c) Rates for automatic air valves, manual air venting valves and the like are deemed to include the costs of associated isolating valves. 33.3.2 Definitions 33.3.2.1 Hydronic distribution piping valves and accessories shall be in accordance with the SPECIFICATION and shall cover all pipework accessories for proper functioning