Aprilaire 4231
Aprilaire Yellow Orifice used in 400 500 600 Series
Price:$3.50
QuantityAmount
4 or more$2.62
Aprilaire 4231 yellow orifice used in models 400 500 550 550A 558 560 560A 568 600. The yellow orifice is sized to deliver 3 gph. As shown in photo.

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