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 side ports, parallel to the switch body Vacuum, pressure or differential input Pressure ranges from 0.1 in/H2O to 550 in/H2O Current rating 20 mA of current 5 – 24 VDC Leaf contacts no “deadband” Additional information on the 500 series.
	502	5/32" smooth ports, perpendicular to switch body Vacuum, pressure or differential input Pressure ranges from 0.1 in/H2O to 550 in/H2O. Current rating 20 mA of current 5 – 24 VDC Leaf contacts no “deadband” Additional information on the 500 series.
	528	1/8" NPT threaded pressure port 5/32" barbed vacuum port Vacuum, pressure or differential input Pressure ranges from 0.1 in/H2O to 550 in/H2O. Current rating 20 mA of current 5 – 24 VDC Leaf contacts no “deadband” Additional information on the 500 series.
	601	5/32" barbed port, parallel to switch body Pressure input only. Pressure ranges from 4.0 in/H2O to 35 psi. Current rating 3A of current Snap contacts “deadband” Additional information on the 600 series.
	602	5/32" smooth port, perpendicular to switch body. Pressure ranges from 4.0 in/H2O to 35 psi. Current rating 3A of current Snap contacts “deadband” Additional information on the 600 series.
	628	1/8" NPT threaded port Pressure input only Molded polymer body for pressure to 45PSI Pressure ranges from 4.0 in/H2O to 35 psi Current rating 3A of current Snap contacts “deadband” Additional information on the 600 series.
	808	1/8" NPT threaded port Pressure input only Die-cast metal body for pressure to 250psi Pressure ranges from 10 psi to 250 psi Current rating 3A of current Snap contacts “deadband” Additional information on the 800 series.
	9370	Parallel ports for pressure, vacuum or differential input. Pressure ranges from 0.2 in/H2O to 3 in/H2O Silver contacts for current up to 5A, resistive Snap contacts “deadband” Single Pole Double Throw (SPDT) Designed for vertical mounting Brass adjustment screw “L” shaped bracket for mounting Additional information on the 9370 series.
	9371	Pressure ranges from 0.2 in/H2O to 3 in/H2O Gold-Platinum contacts for current as low as 20mA Snap contacts “deadband” Normally Open Designed for vertical mounting Brass adjustment screw “L” shaped bracket for mounting Additional information on the 9371 series. Parallel ports for pressure, vacuum or differential input.