What I think he is talking about , Tazza , is on the excavators there are mini quick coupler males on each stage of the 3 stage pump , I was never able to find a match back then for them in the after market , they are much smaller than the aux couplers , the dealer is very expensive I remember as I have one but can't really remember if it was $50 or $90 US each , you really don't need it as if you unscrew the coupler there is a #8 (3/8) JIC male fitting under the coupler , takes a minute longer but gets the job done