Size: 1/2 inch; overall dimensions: 2-3/16 high x 5/8 inch width Assembly includes: (2) polypropylene fittings, (2) acetal nuts, (2) silicone gaskets, (1) TPE port cap, complete directions, and a template for installation All-plastic fitting permits retrofitting of closures for liquid transfer Fits tubing with an inner diameter of 1/4 inch Autoclavable; leakproof