GREENLEAF Brand MADE IN THE UNITED STATES OF AMERICA! MV300CFG Ball is diamond turned, after molding, to make it spherically perfect, which provides precise contact between ball and seats FKM seals Precision molded in polypropylene. Polypropylene is reinforced with fiberglass for additional strength PTFE self-lubricating stem bushings and seats cannot stick or bind Self-aligning ball moves freely against the PTFE seats for smooth operation. The valve opens and closes with very little pressure on the handle Stainless steel bolts 150psi Maximum operating pressure 300 psi