Fits,
Molded White Plastic with Broad Flange
Per ABYC "Safety Standards for Small Crafts"
Not Recommended for Use Below the Waterline 
For 3/4" Hose 1" Max Hull Thickness

Dimensions:
  H = 80 mm
  D = 50.5 mm
  D1 = 19 mm
  d = 27 mm
  d1 = 19 mm
  di = 11.5 mm