The Johnson Controls SEC99AA-18 is a heavy-duty UltraCap armored capillary assembly designed for high-pressure HVACR applications, specifically for connecting pressure switches and transducers to refrigeration lines. This 18-inch capillary tube features a 0.06-inch internal diameter to minimize oil clogging and pulsation issues while maintaining rapid pressure response. Both ends are equipped with 1/4" SAE female flare fittings featuring straight angles and valve depressors, ensuring a secure, leak-proof interface without the need for additional adapters. Built to withstand extreme vibration and pressure fluctuations, the SEC99-series construction provides superior durability compared to standard copper capillaries. This model is technically identical to the SEC99AA-18C, offering identical performance and installation specs. For contractors requiring reliable refrigeration pressure connections, the stainless steel braiding protects the internal tubing from mechanical damage and work-hardening failure, making it a critical component for maintaining system integrity in commercial racks and condensing units. Key Performance Benefits Enhanced Durability: The armored capillary design protects against vibration-induced fatigue and physical abrasion found in high-cycle refrigeration environments. Reduced Maintenance: A 0.06-inch ID reduces the risk of orifice blockages from oil or debris compared to smaller standard capillary tubes. Direct Compatibility: Equipped with dual 1/4" SAE female flare fittings and built-in depressors for efficient HVAC pressure switch installation. Universal Application: Compatible with all standard non-corrosive refrigerants, ensuring versatile use across various Johnson Controls refrigeration parts. Common Technical Questions What is the difference between SEC99AA-18 and SEC99AA-18C? There is no functional or technical difference between these two parts; the "C" designation typically refers to commercial packaging, but the armored capillary specifications remain identical. Can this capillary be used for oil pressure monitoring? Yes, the UltraCap armored capillary is ideal for oil pressure controls where high-frequency vibrations often lead to failure in unreinforced copper lines. Are the valve depressors removable? The 1/4 inch SAE female flare fittings come with fixed core depressors designed to actuate Schrader valves upon connection, preventing the need for separate valve core removal tools. 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.
