4" X 4" Flexible PVC Coupling for HP190 Fan Mounting. Used to connect HP190 4" inline fan with 4" PVC pipe. Rubber components assists with sound and vibration reduction. Commonly used for radon fan mounting. Specially sized to accomodate 4.75" collar on HP190 fan.NOTE: This is not a straight 4x4 coupler - one opening has a larger diameter to accomodate collar on fan.
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