We use Tranco Valve references predominantly, which feature a three, four or five digit number (which was later prefixed with 105-). No interchange or search facility is provided for James reference numbers; though if you know the James reference of the valve you require, please email us and we will advise the corresponding Tranco number where available. We also list a limited range of later TRW and AE 90000 series numbers where they do not interchange with Tranco reference numbers. These valves feature the manufacturer prefixes TRW or AE, rather than TR, before the numerical reference. The majority of valves are listed with key dimensional information - Head Diameter, Stem Diameter and Overall Length, as well as category of Head Style and Stem End Style to aid selection.