Perfecto Manufacturing APFSA1507 Marineland Undergravel Filter Flow Spout Elbow for Aquarium

These replaced the elbows that came with my Lee's 10 Premium Undergravel Filter and they work much better than the orignals for a couple reasons.One is because they are square so the cartridges fit perfectly in side the elbows unlike Lee's funky shaped cartridges and two you can buy refillable cartridges for them.I recommend buying two sets of refillable cartridges just in case one breaks or just so you can have a set already to go when its time to change them

These work great. Great price. I just buy a new one when needed instead all that scrubbing. Must better to toss and put a new one on.

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