This is Atlantic Water Garden's 3" Check Valve Assembly. We have a large selection of Installation Tools/Plumbing and other water features from Atlantic Water Gardens.
Manufacturer's Description
Atlantic's AWGCV30 features a full flow 3" öswing style' check valve with an offset valve body, 90_ elbow and a 3" rubber coupling on the outlet. A 3" pump discharge pipe (not included) can be extended to any length using 3" PVC.