These fit on the inside of the female 1/8" BSP fittings, such as are found on 1/8" female BSP supply hoses. If you need a gasket to seal a male 1/8" fitting, we recommend C_241. 9 x 5 x 1mm.
WARNING: This product can expose you to chemicals including lead, which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to www.p65warnings.ca.gov.