Shoggy already presented the pros of his pump decoupling, the shoggy sandwich, in part 3. Now, you can get the only official set at aqua computer Berlin. Shoggy was not satisfied with the sounds his pump did in combination with other pump decoupling sets. He then searched for an easy way to silence it. With some special rubber components and a good idea he finally made it.
You can find the instructions over here but it's in German.
Alternatively, you can order the mod at Aqua computer for 6.90EUR.