SPG 16-14 is a model number of 16mm x 14mm stainless steel union straight reducer push-in air fittings, which can connect 16mm diameter and 14mm diameter tubing. Constructed of high grade 316 stainless steel, these durable union connector reducer push-in fittings provide a simple push-pull method of connecting pneumatic tubes and can hold a variety of tubing material including nylon, PU, PA, Teflon...