The product information does not explicitly mention suitability for outdoor use. However, it is described as a utility sink pump designed for indoor spaces without proper drainage, such as basements, laundry rooms, and bars.
I installed a In-Line Air Admittance Vent on the vent line and it reduces the flow of the water tremendously. Is there a right or wrong way to do this or it doesn't work well without putting vent outside?
This product cannot be installed with a In-Line Air Admittance Vent, this installation method is incorrect. The exhaust port should be installed outside for easy exhaust.