two 3/16 in. w by 1/16 in. h projection on od of ist end spaced 180 deg apart zinc inside surface treated rigid, threaded internal npt 2nd end thread series
Used on rlm truck, van, shop, 2 1/2 ton, 6x6 (m109a3). rd mtg flange 1-3/4 in. od, 3 mtg holes 7/32 in. dia equally spaced on 1-1/4 in. dia circle enamel outside surface treated plain npt all ends thread series