Patent for an improvement on a previous faucet, patent no. 539,633. This faucet is "a valve-seat consisting of a cylinder having an internal shoulder, a tubular valve operating within said cylinder and below said shoulder, a packing-ring carried by said valve and engaging said shoulder, a piston-road attached to said valve for operating the same, and a drop-valve in the lower end of said tubular valve, substantially as specified" (lines 60-69)