SIEMENS 3SB35001TA20 Push Button, 22mm, 1.57 In. Mushroom, Red. More details: Push Button Operator, 22mm, Maintained / Maintained, Type of Operator 40mm Mushroom Head, Basic Material Metal, Head Material Polycarbonate Plastic, Bezel Nickel Plated, Brass/Zinc Die Cast, Color Red, NEMA Rating 1, 3, 4, 4X, 12, IP Rating 67, Standards UL, CSA and CE