This Zodiac Aerospace (aka Monogram Systems) equivalent Vacuum Toilet Test Stand (VTTS) is used for bench testing, troubleshooting, repair and calibration of various B737-600, B747-400, B757-200, B767-300, B777-200, Vacuum Toilet Assemblies , P/N 15800-022-X, P/N 15800-029-X, 38000-150-X Series as manufactured by Monogram Systems and P/N 7900063, 7900064, 7900065, 7900066, 7900253 Series as manufactured by Evac/Envirovac, as specified in ATA 38-33-10, ATA 38-38-20 and ATA 38-30-15 respectively.