Nalgeneā¢ Check Valve and Positive Connector
By NalgeHDPE with silicone diaphragm
Useful for vacuum systems. Works best between 10 and 28 in. Hg. Prevents back pressure with aspirator-type vacuum pumps. Can be taken apart for cleaning. Available in one size with 3/4-in. long tubing connectors, which fit 1/4-in. through 5/16-in. I.D. tubing. Not for use with liquids.