Description Specifications Manuals Reviews Checkvalves designed to regulate water flow for groundwater sampling and purging. (1/2 in) - fits 1/2 in OD Tubing (1 in) - fits 1 in OD Tubing (1/4 in) - fits 1/4 in OD Tubing Customer Reviews No reviews yet Write a review 0% (0) 0% (0) 0% (0) 0% (0) 0% (0)