Dimensions – 2 1/2" L Dimensions – 3/8” Dia. Dimensions – 1 1/2" Pin Depth Stainless Steel Head 3/8” Nut (2) Works for gray and black water Helps to prevent false conductance Primarily for installation in black water (holding) tanks Roof prevents snags and sticking Hardware (3/8" nut) comes with probes Set of four