Hi,
As far as I know the twin outlet tap is no longer available - I did try very hard to source one. I ended up with a single outlet tap from DS and used a T piece. There was insufficient flow at WOT, due to the filter screen being too fine, so 1&2 became starved. I swapped the coarser screen from the original tap which was stained but serviceable and now all is well. Let us know if you find a 2 outlet supply somewhere!
Ian