The BP33A contacts are designed for use on industrial or residential overhead doors. The BP33A is also ideal for any other large or loose fitting doors. The switch is contained in an aluminum casting and secured with a high grade epoxy seal. The premium Alnico 5 magnet is contained in a plastic casting and secured with the same high grade epoxy seal. An aluminum "L" bracket is provided with the magnet allowing adjustable mounting of the spacing between the switch and magnet. The wiring of the switch is protected in a flexible stainless steel tube. The BP33A switches are completely waterproof and hermetically sealed, therefore allowing them to be used in all exposed applications.