- 1/2" 30% retainer clip for transmission/oil cooler line fitting
- Used on 1/2" O.D. tube with 30% transmission flare
- Not for use on 1/2" O.D. tube with 39% transmission flare
- Blue in color 

Replacement clip for fittings:
4207, 4220, 4268

For technical bulletin explaining 39% vs 30% fittings and retainer clips see DOWNLOADS 

OLD FMSI Part# 4247