There Isn't One
While there is a manual pump it isn't plumbed to pump the bilge. Unless the previous owner (I assume you're a new or recently new owner) changed things, the manual pump is on the bulkhead in the lazarette aft of the head.A possible solution could be to insert a Y-valve upstream of the existing manual pump and add another hose that goes into the bilge with a strainer.Hope this helps. By the way, the Hunter 35 is a Great Boat!