The U.S. aircraft register, updated daily
Parts

Petcock

0 failure reports named the petcock in the last ten years, 3 since 2009.

Reports by year

001222200912010
Reports by year, as a table
reports
20092
20101

Sources: the FAA's service difficulty reports since 1995 (a report is a part that failed and was fixed, as filed by an airline, repair station or owner; the count shows reporting as much as reliability) and the parts manufacturer approvals in the FAA's Dynamic Regulatory System. The part name is the reporters' and the approval holders' own words, reduced to the first plain words so that spellings meet.