Description 1.2 Bar Expansion Tank Cap (Non‑Rotax) Description An aluminium expansion tank cap calibrated to 1.2 bar pressure, designed to increase coolant boiling point and enhance system performance. Suitable for non-certified aircraft cooling systems. Key Features Pressure release set at 1.2 bar (17.4 psi) to maintain optimal coolant pressure Precision-machined aluminium construction with a silicone seal Designed for direct use with 42–48 mm coolant tank necks Replaces standard low-pressure caps to boost system efficiency Benefits Raises boiling point of coolant, reducing overheating risks under high load Stabilises coolant flow and reduces cavitation in engine coolant circuit Offers reliable pressure control without damage to hoses or cooling pathways Easy upgrade for enhanced thermal management in performance-oriented engines Applications Ideal for experimental or modified Rotax cooling systems Suitable for use with ultralight or amateur-built engine conversions Not intended for use in certified, factory-standard aircraft setups Installation Notes Install only on expansion bottles specified for 1.2 bar service Inspect the silicone sealing ring regularly for wear or deformation Check pressure cap operation with a handpump tester during annual checks Replace cap if it fails to hold specified pressure or shows signs of corrosion
