Thomas Products Ltd. manufactures level switches including custom, bottle, side-mounted, single-level, pancake, and liquid level indicators. The company's liquid level indicators are for use in hazardous locations and feature 3/4" NPT mounting sizes, operating temperatures of -40 to 225F, and operating pressures of up to 400 psi.

Innovative Components manufactures vertical, horizontal, and special liquid level switches. The vertical switches are available with 1/4" NPT or 1/8" NPT mounting threads. Both the vertical and horizontal switches include a choice between a SPST or SPDT reed switch, and 24" or 20awg PVC lead wires. The special switch types include: temperature/level, bilge, high temperature/slurry, external bottle, and thermal well. The company also produces liquid level indicators/tank gauges.

Whitman Controls manufactures side-mounted level switches and vertical-mounted level switches with 1/2" NPT, 1/8" NPT, or 1/4" NPT fitting types. The switches are used in liquid process systems including drinking water systems, and within the oil and gas industries.