Compare the four Product Series below. Make your selection based on the amount of current you need to switch, and whether you want a   mechanical differential, or "deadband". Then look over the port options, and choose a configuration. Click on the picture to make your selection.

	Series	Description
	501	5/32" barbed ports, parallel to switch body, for vacuum, pressure or differential input.
	502	5/32" smooth ports, perpendicular to switch body, for vacuum, pressure or differential input.
	528	1/8" NPT threaded pressure port, 5/32" barbed vacuum port.
	601	5/32" barbed port, parallel to switch body, for pressure input only
	602	5/32" smooth port, perpendicular to switch body, for pressure input only
	628	1/8" NPT threaded port, pressure input only, molded polymer body for pressure to 45PSI
	808	1/8" NPT threaded port, pressure input only, die-cast metal body for pressure to 150PSI
	9370	Silver contacts for current up to 5A, resistive. Parallel ports for pressure, vacuum or differential input.
	9371	Gold-Platinum contacts for current as low as 20mA. Parallel ports for pressure, vacuum or differential input.