Excellent Fit By Army Air Assault on 7/17/2016
Army Air Assault wouldn't recommend this product to a friend
perfect fit out of the gate - whereas others gotten wrong.
550 o-ring By Harpo on 1/26/2015
Harpo would recommend this product to a friend
Replaced o-ring on my Two Little Fishes media reactor due to air getting into housing. Replaced old one and all is good.
fits perfect By Mike on 1/13/2013
Mike would recommend this product to a friend
O-Ring fit perfect with no leaks. Fast shipping. Will buy again