BS-4839SMB is a heavy duty Matte Black soap dispenser designed for heavy traffic applications. It features: Solid Brass Soap Spout Construction (not plastic as with most competing dispensers), Industrial Quality Soap Pump System Generally Used for Medical and Aerospace Applications. A Workhorse. This soap dispenser is designed for above sink installation and use. It is installed in the sink vicinity near the faucet. It is available in battery power, or optional AC power. Soap is refillable from below the counter. This BathSelect Automatic Soap Dispenser is ideal for bathroom applications where soap dispensers are an intricate component of the room's overall design element.