Level Displacer Switches Single Stage Displacer Switch Single Stage displacer switches utilize one electrical control mechanism and are factory calibrated. BROCHURE Dual Stage Displacer Switches Dual Stage displacer switches utilize two electrically separate control mechanisms and are factory calibrated. BROCHURE Triple Stage Displacer switches Triple Stage displacer switches are designed to provide three electrically separate control signals in a selected sequence in response to liquid level changes. BROCHURE