1. A&P Hydraulics
2. AeroControlex
3. AKKA Technologies Group
4. AMETEK Inc.
5. Arkwin Industries Inc.
6. Beaver Aerospace & Defense Inc.
7. Donaldson Company Inc.
8. Eaton Corporation plc
9. Fluid Conditioning Products Inc.
10. Freudenberg Filtration Technologies GmbH & Co. KG
11. HALE HAMILTON
12. Hindustan Aeronautics Limited
13. Liebherr-International Deutschland GmbH
14. MANN+HUMMEL International GmbH & Co. KG
15. Norman Filter Company
16. Pall Corporation
17. Parker-Hannifin Corporation
18. Pneumatic & Hydraulic Company
19. Porvair Filtration Group
20. PTI Technologies Inc.
21. Recco Products
22. Safran Group
23. Sargent Aerospace & Defense
24. Triumph Group Inc.
25. Tronair Group of Companies