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Series 3A and 3AN: for Heavy-Duty Service – High-Tech Duralon® Rod Bearing – State-of-the-Art – Rod and Piston Sealing System – Heavy-Duty Piston-to-Rod Connection – 1.50″ – 14.00″ Bores – 150 – 250 psi Pressure Ratings – N.F.P.A. Interchangeability — 23 Mounting Styles -No Lubrication Required with 3AN.