It is, sized for National Frames complete with steam generator.
Looks to be the business and should really speed up what was my major bottleneck last season, the time taken for uncapping. It's fully height adjustable, but I think you need to run one super frame type only...i.e it won't neatly uncap both SN1's and SN4's without being re-adjusted for each type. But I stand to be corrected....practical experience will provide the answer to that.
About time I sorted out my hodgepodge of SN1's SN4's and Manleys super frames.