Good O-Ring, same as the original on my IO-540-D4A5. If youre looking for the oil dipstick tube o-ring that goes under the yellow cap, with a flip style top, this is the one.
This O-ring was absolutely awesome!
Superior MS29561-010 O-Ring
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.
The o-ring is a -08, but Superior lists it as a -8 on their web and packing slips. We stock MS29512-08 as well. This is the Superior version of the same o-ring.