Looking at the Orlandi and Paioli taps, just found out that the only difference is in the thickness (and so bigger orifice) of the only moving part : the "mushroom".
The rubber that fits in the tap (and over the three inlets/outlet orifices) is the same, just a circular piece of rubber (better take one that can handle the "stuff" ) with three holes in it.
Taking the electronic balance out today, think I found some aluminium taps that weigh just a tad less
ciao
ducadini