The U.S. aircraft register, updated daily
Parts

Valve Two

No failure report names the valve two. 2 FAA approvals let 2 companies make a replacement valve two, Kidde Aerospace holding the most (1).

Approved replacement parts 2 parts manufacturer approvals

A parts manufacturer approval (PMA) lets a company other than the aircraft's maker make a valve two and sell it as an approved part for the models named. These are the companies holding such approvals for a valve two:

MakerPartReplacesFitsGrantedStatus
Kidde AerospaceValve Two Way Check 893725893725Bombardier BD-500-1A10 CSeries (CS100)2016-07-11current
B/E Aerospace INC, Lenexa FacilityValve-Two Way, Normally Closed PMA VA-50031VA-50031Boeing B747 Series2002-07-31current

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.