Nitrogen Charging Bolt Installation - SPNV 0512 WP Shocks The Nitrogen Charging Bolt replaces the original Allen bolt on the reservoir. You will need a Nitrogen Needle (TSNN 01). SPNV 0512 can be used on many "non-rebuildable" shocks. â–ºClick here for instructions. Fits all current WP piggyback shocks. SPNV 0512 is excellent for small quantities of shocks. If you service a large volume of WP Shocks please consider TSNC 02 - Add to Cart |