Zone Valve Box with Sensor - 1/2"OXY, 1/2"N20, 1/2" Med Air, 3/4"VAC. 3.4" WAGD (COPY) With this product s highly innovative 2 in 1 design, we have combined our first-class Area Alarm with our Valve Box, acommodating both in one space providing an aesthetically pleasant, affordable package. The ability to install sensors directly inside the Valve Box eliminates the need for prolonged, complex maintenance, as well as the search for absent sensors. Amico s Valve Alarm Combination Unit is built to offer users years of proficient service. Previous concerns regarding convenience, space, maintenance and accessibility become uncertainties of the past, with the ground-breaking, Valve Alarm Combo Unit.