A march pump is a food grade/heat tolerant pump which is great for moving hot liquids from one container to another. I currently use it to recirculate the wort during chilling (creating a whirlpool on the IC) and to move the finished wort into the primary.
Not necessary by any means, but nice to have.
Atomic Dog Brewery
On Deck: Centennial IPA, Dry Irish Stout
P: Cascade Pale Ale
T: Carbed Crystal Light, Root Beer, Vanilla Cream Soda, Tripel IPA, Apfelwein
e^(pi*i) + 1 = 0