BS1806 004 ( BS004 ) 0.070" X 0.07" NBR Nitrile Acrylonitrile Butadiene ShA 50 Black Z16 O ring Oring Sealing O ring Rubber|rubber cone|o ring rubberrubber darts - AliExpress
General Oceanics :: Parts :: 2030 and 2031H Flowmeters :: ORING 004 BLACK BUNA
Silicone o-rings Size 004 Price for 100 pcs | eBay
Genuine honda spare part 42653-001-004, O-RING 40.5X3, C50/70.