This multi-purpose wall fitting is well-suited to thick-walled spas (up to 50 mm), such as wooden hot tubs. You can use it to fix in place a strip skimmer or a suction fitting. You should install it with a gasket and also use silicone between the wall fitting and the interior wall of the spa.
To install a strip skimmer, you just need to press the vertical grille against this wall fitting, and screw in the grate to hold in place.
To install a suction fitting, simply screw an anti-vortex grille into the wall fitting.
Hole width to drill (external thread diameter) : 60 mm
Maximum wall thickness: 50 mm
External diameter of the face of the fitting: 85 mm
Inside diameter of the face of the fitting: 45,5 mm