People often ask how do you plumb the Vectra pump to your tank. While I know it is easier to use flexible tubing, that's never my preference. Plus, the Vectra doesn't come with a hose barb connection. Whether you use this pump internally or externally, it's still important to get the PVC glued into the blue part correctly.
The Vectra M1 uses 3/4" PVC pipe. That's what you see in the picture above, it's the return pump for the 60g frag system.