A pull-out guide assembly for a drawer comprises a first body rail, a second body rail, a first moveable rail, a second moveable rail, a first support roller mounted on the first body rail, a second support roller mounted on the second body rail, a first running roller mounted on the first moveable rail, and a second running roller mounted on the second moveable rail. In a preferred embodiment, the circuitry provides an amplifier for each transducer element, and then conditions the output of the amplifier in several ways. The bonding groups utilize bandwidth unused by the first video streams. The injection chambers supply and meter the amount of additives injected. Therefore, a probability of a false warning can be reduced. A valve seat is formed in the cap which is separate from the pump body.