Spaguts TECMARK replacement Pressure switch by TECMARK. Model 3505. Adjustable Range from 2.0 inch to 5.0 inch of water column (W.C.) on pressure Rise or pressure fall. Note that 27.7 inch of W.C = 1.0 psi. Electrical rating is 5 Amp, 120V at 277V (non-inductive). it has a built-in SPDT electrical switch for low or high voltage application. This pressure switch is normally used on a baptismal equipment. This switch is similar to a water level sensor, and normally used to detect the water level in a baptismal pool. Spaguts p/n: 45-100-3505. Replacement option for the following pressure switches: aa-1801, bs-3505, style number 02621, 3400 Series, _3505. Dimensions are approximately 3.0 inches tall, and 1.9 inches in diameter. Note that the electrical switch extends the diameter length to approximately 2.3 inches at the top. This pressure switch fits in 1/8 inch NPT hole, and has 3/8 inch outside metal thread measurement. Easily adjustable wheel from 2 to 5 W.C., and adjustments will need to be performed by the installer for the desired application and/or requirements. Ul recognized, for Canada, and the United States, as an operating, limit safety control. This item comes with 1-year limited Warranty, and is non-returnable.