These PVC Unions are made by Aqua Ultraviolet and have the same thread as any of their unions. Great for quick and easy disconnection and re-installation. The gasketed seal between the two halves of the union make it a sensible way to connect and disconnect glued plumbing sections. And since shipping is free on all orders over $99 picking one up along with your pump or skimmer is practical.
A40116 - 2" Slip x 2" Slip Union in Black
A40032 - 2" Slip x 2" Slip Union in White
A40082 - 3" Slip x 3" Slip Union in White