- 5/8" 39% retainer clip for transmission/oil cooler line fitting
- Used only on Original Equipment 5/8" O.D. tube with 39% transmission flare
- Not for use on 5/8" O.D. tube with 30% transmission flare
- Blue in color 

Replacement clip for fitting:
4240

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

OLD FMSI Part# 4248