What is the cross reference for a rotax filter rb-x312?

The cross reference for a Rotax filter RB-X312 is typically the Hiflofiltro HF138 or the K&N KN-141 filter. These filters are often used as compatible alternatives for various Rotax engines. However, it's essential to verify compatibility with your specific engine model before making a purchase. Always consult the manufacturer's specifications for the most accurate information.