Consult a plumber
For Basic Drywall Cut-Outs
4" x 4" flexible coupling
machined flange for support against tank wall
Hole Saw, Carbide-Tipped, 2-1/2-In. Compare N Save Consult a plumberDiablo, 2 1 2", carbide tipped hole saw, cuts both wood & metal, use on wood, nail embedded wood, plastic, aluminum, metal, cast iron & stainless steel, delivers longer cutting life than bi metal for faster cutting performance & increased productivity 2 3 8" cutting depth for 40 percent deeper holes in single pass & increased productivity, variable tooth design for faster cuts, snap lock plus mandrel system for quick & easy changes with no down time,