The Hydro Flow 90° Bottom Draw Adaptors allow the user to draw water down close to the bottom of your hydroponic system or reservoir while using a standard submersible pump. The 1/2" NPT diameter adaptor is compatible with EcoPlus® 264 and 396 pumps. This adaptor will draw water down to 1/2" in the bottom of your reservoir or tank. The 1" NPT diameter adaptor is compatible with EcoPlus® 633, 1056 and 1267 pumps. This adaptor will draw water down to 1" in the bottom of your reservoir or tank. Matching Nation Pipe Thread (NPT) makes a secure connection. Quickly turn your front draw EcoPlus® pump into a "bottom" draw pump with a Hydro Flow Bottom Draw Pump Adaptor.