This is a replacement double o-ring shock cartridge from Losi. This shock cartridge screws into the bottom of the shock body.
This product was added to our catalog on August 3, 2007
Wednesday, Mar 5 2014 (about 7 years ago)
Losi Double O-Ring Shock Cartridge
I purchased 4 of these to replace the old, worn out originals on my XX-CR's shocks and they work great! Mine also came pre-assembled, but I don't know if that is standard.