W=17.50"   L=43.5"   D=11"   B=9.125"     20 Gallon Tank 

For 3" fitting use a 3 1/8" hole saw.   For 2" fitting use a 2 1/8" hole saw.  For 1 1/2" fitting use a 1 5/8" hole saw.  Use ABS cement to install fittings.  Repairs can be made with ABS cement.  MFG#  HT 264