Broad compatibility: The Sump pump check valve is suitable for any pump with 1-1/2 "NPT flow rate. Transparent appearance: Check valve aquarium's valve body is transparent, you can directly observe the flow of water and whether the pipeline is blocked by foreign matter. Prevent water backflow: there is a check valve in the middle of the pump to prevent sewage from entering the sump again. The check valve has a unique spring-loaded baffle that keeps the pump quiet during operation. What's included: Comes with 4 stainless steel clips and 2 NBR couplings. After-sales service: If the product has any quality problems, please contact us, we provide a one-year warranty policy.