STYLE 1 drain plug fits our old style coolers which have vertical looking bars on the inside of the cooler lid (cooler drain plug inlet hole is 1.14" or 29.13mm).
STYLE 2 drain plug fits our new style coolers which have a Hooked logo on the inside of the cooler lid (cooler drain plug inlet hole is 1.37" or 34.72mm).
The certain drain plug style will ONLY work for the drain plug inlet hole you have, you cannot interchange Style 1 and Style 2 drain plugs.