Seal-Lok™ fittings and adapters provide high-integrity sealing for hydrogen and CNG (compressed natural gas) fuel storage and delivery systems. Seal-Lok product is used worldwide to create reliable, leak-free connections in alternative fuel service cars, trucks, buses and filling stations, helping manufacturers ensure productive and profitable operations.  Hydrogen Systems Seal-Lok with H2 technology is specifically designed for high-pressure hydrogen systems. Previously unrealized customer benefits have been gained with the development and validation of Parker's H2 stud and port technology, which is fully interchangeable with standard SAE J1926 fittings and allows full 360° positioning and sealing at 700 bar/10,000 psi. A Parker-exclusive sealing arrangement also prevents O-ring extrusion under extreme high pressure.  Seal-Lok fittings meet the requirements of EIHP (European Integrated Hydrogen Project) Revision 12b and EC79/2009 as tested by TÜV. With these approvals, Parker has the industry's only approved stainless steel fittings for 700-bar/10,000-psi hydrogen service. The fittings have been validated in sizes ranging from ?" to ?" (6 mm to 20 mm). Multiple O-ring compounds are available to meet low-temperature, high-pressure system demands, including the extreme demands of fast filling.  CNG Systems Seal-Lok fittings and adapters with tested O-ring compounds are also approved for CNG service up to 350 bar/5,000 psi per ECE R110 and ISO 15500. Both steel and stainless steel fittings have been validated for such onboard CNG vehicle service.  The Seal-Lok Advantage Seal-Lok fittings consist of a nut, sleeve, O-ring and fitting body. The fitting body face contains a high durometer O-ring held captive in a precision-machined groove. As the nut is tightened onto the fitting body, the O-ring is compressed between the body and flat face of the tube flange to form a high-integrity seal.   Parflange® Tube Connection System Seal-Lok fittings for hydrogen and CNG service have been tested and approved for assembly using Parker's Parflange tube connection system, which eliminates the need for braze or weld joints by providing a reliable flange or flare tube connection where a potential leak could occur. Parflange technology utilizes an orbital spindle process that cold forms a 90° flat face on the end of the tube. For more than ten years, it has been the preferred method of preparing tube ends for use with O-ring face seal fittings.
  • reliable, leak-free connections
  • full 360° positioning
  • sealing at 700 bar/10,000 psi