Features:
Stainless-steel polished flange
Suitable for 1 1/2" (38mm) hose
Key to open the cap is included
Only a quarter turn will lock/unlock the cap
Yellow cap is marked with "TOILET" makes it easy to identify that this deck fill is for Waste Water
Cap is tethered by chain for easy of use and cap retention
Water and air tight
Cap is sealed with a replaceable ring
Flange sits on a rubber gasket
Specifically designed for marine applications and made with high quality materials to minimize corrosion and wear for a long service life
Mounting hardware NOT included
Specs:
Handle (Key) Length: 4" (102mm)
Diameter: 
Flange gasket: 3.54" (90mm)
Flange: 3.35" (85mm)
Hose Connection: 1.5" (38mm)
Mounting Depth: 2.91" (74mm)
Installation holes on center: 2.36" (60mm)
Weight: 8.4oz (238gr)