1/4" female x 1/4" male British Standard Pipe. Found in some models of Bezzera, BFC, Conti, Expobar, Fiorenzato (C.S.), Gaggia, Grimac, Nuova Simonelli, La Pavoni, Reneka, Royal, SAB Italia, Saeco, La Scala, La Spaziale and Victoria Arduino. They will NOT fit all La San Marco as listed in some diagrams, because of the small ferrules on San Marco pipe ends.
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.