Single, water jet pump providing a rough vacuum suitable for many filtration, distillation and aeration applications. With integral non-return valve to prevent suck-back and flooding. Borosilicate glass, with vacuum connection ferrule for 6mm to 9mm bore flexible tubing and water connection ferrule for 10mm to 12mm bore flexible tubing. A separate R¾" sleeve nut and R½" reduction adapter are also provided. Recommended water pressure: 3 to 6 bar.