Yes a valve on the attachment needs flow in a certain direction to function properly. But the couplers on the SS to the attachemnt. You will have a male and a female x 2 right. Males on the SS and Females on the atchm, OR Females on the SS and Males on the Attchm, Or one male and one female on SS and corresponding on the Attch.... So assuming you have the proper hose on the attachment to the proper aux connection on the SS, so the attachment function as required, do the couplers respond any differently in any of the above combinations.....
Oh never mind...I would be more than happy to wait till all the bugs are worked out prior to taking possesion of "my splitter"....just goofing. Post some pics when you get er up and running!!