When you're out in the field servicing high-efficiency units, having the correct OEM Lennox gas orifice is non-negotiable for achieving the design-specified manifold pressure. The Lennox 57W68 is a professional-grade #44 natural gas orifice engineered to provide precision gas flow metering in compatible residential and commercial furnaces. This component, which is 100% interchangeable with Lennox 57W6801, features a 1/8-27 NPT thread and a 0.72" overall length, ensuring a direct-fit replacement without the need for field modifications. Using a precision-drilled 0.0935" diameter port, it maintains a consistent BTU input, which is critical for preventing delayed ignition or incomplete combustion in Lennox HVAC systems. Replacing a fouled or incorrectly sized burner orifice with this genuine silver-coded part ensures the burner flame characteristics meet factory requirements for optimal heat exchange and safety. Key Benefits: Precise Metering: Specifically sized as a #44 drill size orifice (0.0935") to ensure accurate natural gas delivery. Universal Compatibility: Fully replaces and is functionally identical to Lennox part number 57W6801. Durable Construction: Brass-alloy composition resists corrosion and thermal stress in high-temperature burner vestibules. NPT Fitment: Standard 1/8-27 NPT threading provides a secure, leak-free seal for standard burner manifold assemblies. Common Questions: Is the 57W68 compatible with LP conversion? No, this is a #44 orifice for natural gas. Liquid Propane (LP) conversions require a significantly smaller drill size to compensate for the higher BTU density and delivery pressure of propane. Can I use 57W68 to replace 57W6801? Yes, these parts are identical Lennox furnace parts. The 57W6801 is simply an alternate SKU for the same physical component. What are the physical dimensions for fitment? The unit features a 0.72" OAL (Overall Length) and follows the silver color-coding standard for Lennox gas-fired components. Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
