This adapter lets you move the pumping blub anywhere along the hose. You just take out the pieces from the part that came with the pump and put them into this piece. Keep the ball and the green retainer ring from original and pop them into this adapter. 

Designed specifically for the “Python Pro-Clean Gravel Washer”

I had success printing with the narrow side down on a raft with no supports, I did have the “experimental bridging" enabled in Cura. 100% infill