These switches have a 2-1/2" Male tank connection. Designed for horizontal mounting on the side of a vessel. The float rod allows for 1-1/2" to 5" field adjustment differential range that can be increased with the use of a longer float rod. Standard switch ratings are SPDT and 250°F. A 400°F switch is available. Nema 4 housing is standard. Explosionproof housings are also available.