Replacement O-Ring for PhosBan Reactor 550
Excellent Fit By Army Air Assault on 7/17/2016Army Air Assault wouldn't recommend this product to a friendperfect fit out of the gate - whereas others gotten wrong.
550 o-ring By Harpo on 1/26/2015Harpo would recommend this product to a friendReplaced 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 1/13/2013Mike would recommend this product to a friendO-Ring fit perfect with no leaks. Fast shipping. Will buy again
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These are a round rubber base o-ring and are designed for the 150 and 550 reactors. Certainly will work well!
This O Ring is not for the BRS reactor. We do have O Rings for our reactors in the link below!