Super-Bands™ polyurethane ring 4 inch white
Ships from US and is sold by Marco Specialties$5.60
Super-Bands™ polyurethane O-ring, standard 4 inch Inner
Diameter, white gloss.
Inner diameter is 4 inches (101.6mm) and the cross sectional
diameter is standard 3/16 inch (4.7mm).
Reference: