The pump adaptor is very well made but doesn't quite work. I wanted to use it to allow manual and electric pumping of my SUP. However (unknown to me before studying it) my 2 pressure mode electric pump adaptor has an extension to push open the valve in the SUP to allow the low pressure pump to work. The adaptor outlet is missing this long feature and the inlet doesn't allow the long feature to fit in. I cut the long feature off my electric pump and then realised what it is for! This wouldn't be an issue for 2 manual pumps but it might be an idea to tell people that doubling up a 2 mode pump and manual pump doesn't work. I can get round it by starting the inflation manually to kick the pump into high pressure mode but it rather defeats the point of speeding up the high pressure part of the inflation.