Ideal for 206's and essential if you plan to install built in products such as a UV or heater and as others have said instead of the black shown in the photo. To use after cutting Fluval finned tubing, simply insert the tubing all the way into the adapter until it stops. The other end will fit both 5/8" and 3/4" barbs with a little grease. Use stainless steel clamps to secure the fittings.
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