Surface Check fittings of the MS15002 series have spring-loaded ball check in the tip.
Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.
Our stock part # MS15002-3 is the current revision used for new design and replacement. Stock part number 04-02329 is an old revision and can not be used for new design. They are physically the same part.