Geoline Polypropylene Single Union Ball Valves. Fiberglass reinforced polypropylene body for strength and chemical resistance. Teflon seats for smooth operation and proper sealing characteristics. EPDM o-rings to handle most fertilizers and chemicals. Viton® on demand. Max operating pressure for sizes up to 1”1/4 PN 16 (232 PSI). For bigger sizes PN10 (145 PSI).