adjustable hand pump
 

Getting my standard pumps to avoid giving too much shampoo or body wash is annoying and was wondering if anyone's seen a hand pump that has an adjustable output amount. I could kludge something by add a stop to a standard pump, but am hoping for something a little polished and easier to adjust. Having trouble finding one via searching, although I do get some relevant patents as results. Not a lot of use. Thanks for any info.