Super-Bands™ polyurethane ring 7/16 inch ID purple
Ships from US and is sold by Marco Specialties$1.50
Super-Bands™ polyurethane O-ring, standard 7/16 inch Inner
Diameter, purple gloss.
Inner diameter is .44 inches (11.2mm) and the cross sectional
diameter is standard 3/16 inch (4.7mm).