− Decrease quantity for Air Intake Coupler, Clamp-on, 4.00 in. Diameter to 4.125 in. Diameter, 2.00 in. Long, Straight, Black, Silicone, Each Quantity + Increase quantity for Air Intake Coupler, Clamp-on, 4.00 in. Diameter to 4.125 in. Diameter, 2.00 in. Long, Straight, Black, Silicone, Each Add to cart