Is there a Plastic Barb to PVC Pipe pipe fitting?
Sometimes the hose barb fittings on a pump or device are removable so you can swap them for another fitting that suits your use. Here, it looks like the hose barbs are molded into the plastic of the pump housing.
For this you can use a short length of vinyl or silicone tubing and a hose barb-PVC fitting of the proper size (shown here). You'd have a few inches of tubing connecting the pump's hose barb and the PVC's hose barb, then run the PVC you need from that.