These are injector internals that are used when rebuilding the injectors. (Most may never use them and just be discarded, but they’re included for the select few shops that are actually tearing the injectors apart for a rebuild.)
The seal kits are sold individually.
Complete the job with these highly suggested add-on products.
Product prices marked with an * may require additonal fees, such as a core charge, which will be displayed in the cart.