3/8" male x 12 mm inside diameter slip. Same as BF_135 or GI_541. The have been produced in raw brass, but now are chrome-covered brass. Used on Bianchi, Brasilia, Fiamma, Gaggia and Vibiemme sight glass assemblies.
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.