PEEK Low-Pressure Unions, Tees, and Crosses hold up to 1000 psi (1/16" tubing), or to 500 psi (1/8" tubing). PEEK flangeless fittings included. Models 02008-00, -10, and -20 take 1/16" OD tubing; models 02008-04, -14, and -24 take 1/8" OD tubing.