For use with repair elbows and tees. Used for repair or alteration of drain, waster, or vent pipe and fittings. Fits cast-iron, steel, plastic, lead, and copper pipe. Especially suited for in-wall or other limited space connections. Extra length allows easy replacement of elbows or tees cut out at joint.The model No. PCXPB215 will fit inside model No. PCXPB32 in event a 3" x 1-1/2" reduction is required.