Prevent water from traveling through the airlines and into the internal compressor components of the KoiAir™ 1 & 2 Aeration Kits with a .750 NPT Check Valve Assembly. This check valve allows a single direction of airflow that is clearly marked on the side for easy installation. To use, simply connect the check valve to your 3/8" - 3/4" insert reducer and KoiAir 1 or KoiAir 2 diffuser plate.
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