− Decrease quantity for Air Intake Coupler, Clamp-on, 3.750 in. Diameter to 3.875 in. Diameter, 1.75 in. Long, Straight, Black, Silicone, Each Quantity + Increase quantity for Air Intake Coupler, Clamp-on, 3.750 in. Diameter to 3.875 in. Diameter, 1.75 in. Long, Straight, Black, Silicone, Each Add to cart