SMI Hammer Unions & Low Pressure Swivel Joints :
SMI Hammer unions for low-pressure services (Fig 100 – Fig 200) feature a primary metal-to-metal seal. This metal-to-metal seal remains leak-proof even one surface is slightly pitted or misaligned. SMI Hammer unions for Medium-pressure services (Fig 400 – Fig 600) is designed supplement the metal-to-metal seal with a resilient O-ring in the male sub.
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