High-pressure hammer unions, with ratings up to 20,000 psi, commonly utilize lip-type seal rings for the primary seal in the female sub. These rings are designed for applications where pressures and harsh chemicals could otherwise compromise traditional O-ring seals. Their advanced lip structure further shields the secondary metal-to-metal seal, protecting it from abrasion and corrosi... https://globalsealstech.com/product/hammer-union-seal-2/