Hole sizes for fittings for overflows

[livingart]

From the Hansen website 

http://www.hansenproducts.co.nz/products/tank/SFTFT-install.htm

 

		RECOMMENDED HOLE SAW SIZES 15mm = 22mm or 7/8" Hole Saw 20mm = 27mm or 1 1/16" Hole Saw 25mm = 34mm or 1 3/8" Hole Saw 32mm = 42mm or 1 5/8" Hole Saw 40mm = 48mm or 1 7/8" Hole Saw 50mm = 60mm or 2 3/8" Hole Saw 80mm = 95mm or 3 3/4" Hole Saw 100mm = 121mm or 4 3/4" Hole Saw   MINIMUM RECOMMENDED  HOLE SIZES Hole Size for 15mm = 22mm Hole Size for 20mm = 27mm Hole Size for 25mm = 34mm Hole Size for 32mm = 42mm Hole Size for 40mm = 48mm Hole Size for 50mm = 60mm Hole Size for 80mm = 95mm Hole Size for 100mm = 121mm

		Remove the Back Nut and the Low Density Poly Washer (the firmer of the 2 washers) from theTank Fitting Body. Slide the Tank Fitting Bodythrough the hole in the tank. The Rubber Washermust be between the Fitting Body Flange and the tank wall (ensure the ribs on the Rubber Washerare sealing against the tank wall).
		On the inside of the tank wall, slide the Low Density Poly Washer back onto the Tank Fitting Body and then wind on the Back Nut.
		Tighten the Back Nut so that the face of both washers make full contact with the tank wall to obtain a water tight seal. Ensure that you comply with the tank manufacturers specifications
		When adding additional fittings it is recommended that either a thread sealing paste or thread sealing tape be used on all threaded connections. We recommend Loctite 5331