The Tube Fittings Division of Parker Hannifin Corp. has expanded its Seal-Lok O-ring face seal tube fitting line to provide alternative-fuel application compatibility. Seal-Lok for compressed natural gas (CNG) provides reliable fuel conveyance in natural gas applications using an elastomeric seal compound specifically designed to address the needs of the market. The compound improves ozone resistance and supports wider temperature range requirements, and it’s fully certified to NGV 3.1, ECER110, and ISO 15500 for on-vehicle CNG applications. Available in tube and hose sizes ranging from ¼ to ¾-in (6 to 20-mm), Seal-Lok technology is said to enhance the performance and reliability of O-Ring face seal SAE J1453 connections. The technology makes Seal-Lok for CNG suitable for high-vibration, on-vehicle applications where metal-to-metal sealing falters. Seal-Lok for CNG applications is available in stainless steel, steel, and XTR-plated (zinc nickel) steel, and is temperature compatible from -40 to +300°F (-40 to +150°C). Port options including SAE J1926-1/ISO 6149-1 straight thread ports and NPT tapered ports.