The U.S. aircraft register, updated daily
Parts

Spray Unit

No failure report names the spray unit. 1 FAA approvals let 1 company make a replacement spray unit, Apollo Helicopter Svc holding the most (1).

Approved replacement parts 1 parts manufacturer approvals

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

For these models most: Robinson R22 (1).

MakerPartReplacesFitsGrantedStatus
Apollo Helicopter SvcSpray Unit Assembly DTM-3-001Modification PartRobinson Helicopter R22, R22A, R22B1991-10-06current

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.