This Is A Bridge Rectifier Used In Some Of The Jacuzzi Whirlpool Bath Spa Systems. It'S Used To Convert 120 Volt Ac Into 110 Volt Dc. Rectifier is a Square Box style, 1-1/16" X 1-1/16" X 7/16" Tall. One Side Has A 45 Degree Angle On The Corner, 3/16" Diameter Round Hole In Center (4) 1/4" Male Spade Connectors Come Out Of The Bottom, 3 Face One Direction, 4Th Faces At A 90 Degree Angle To The Others. Spades Are 7/16" Long.