THE WALKER HYDRANT. The main features of the Walker hydrant, made by the Coffin Valve company are set forth in a card as follows: Waterway largest made. Least friction Absolutely No Hammer Leaks impossible from broken posts Kannot buckle operating rod. Easy to repair—No digging. Reliable drip. Prevents freezing. At Milwaukee, Wis., Dr. Otto Fiedler, of the health department, seems to see but little, if any improvement in the condition of the lake water.