New Sentinel series drain valves from Van Air Systems, Inc. are designed to reliably manage any fluid by incorporating a clog-resistant, heavy duty ball valve. Two models provide dependable around-the-clock draining. In addition to running in programmable modes, both models can operate in response to an optional liquid level sensor for zero air loss draining. Model MDV-400L features an easy-to-use keypad for timing adjustments and an LCD cycle status readout, which continuously counts down the remaining cycle or drain open times. Model MDV-400I is a basic drain with a power LED and test button located in the top cover. Cycle and open times are reset by removing the top cover and adjusting switches on the internal circuit board.
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