2.25 OUTER DIAMETER AND 1.80 INNER DIAMETER - The outer diameter of 2.25 inches is for the base of the rubber ladder bumper, while the inner diameter of 1.80 inches is for the part that plugs into the pool ladder tubing. A slight taper ensures a snug fit and also allows for easy removal as needed.FITS 1.90 SWIMMING POOL LADDER TUBING - Universal fit for standard swimming pool ladders with an inner diameter of 1.90 inches. This is the standard size for pool ladder tubing. The nominal pipe size is usually 2 inches outer diameter with inner diameters around 1.90 inches, depending on the tubings thickness.MOLDED RUBBER BUMPER - High-quality, thick, and durable molded white rubber ensures that this pool ladder bumper will be serviceable for longer without cracking, deforming, or loosening. This rubber ladder bumper can withstand changes in temperature, pool water chemicals, and rough handling.RUBBER LADDER BUMPER FOR SWIMMING POOL LADDERS - Protect your pools vinyl lining with a reliable rubber bumper that will last for many pool seasons to come. Theres no need to wait to replace cracked, brittle, and loose bumpers!INSIDE PLUG BUMPER CAP - Note that this type of rubber bumper plugs into the interior of the ladders tubing. Measure the inner diameter of your pool ladders tubing to ensure a snug fit. The considerable amount of excess rubber on the bumpers base ensures maximum protection for your pool surface.