Socket for cleanout plugs with 1-1/2" x 1-1/2" square raised head. Works great for most 4" brass cleanout plugs. Can be used with the T-handle supplied in the kit (or sold separately) or a standard 3/4" socket wrench.  This socket is NOT included in the 10 piece set. Brass cleanout plug not included. 

Square socket for 1-1/2" raised head cleanout plugs - Brass 4"