A downstream injector bypass system lets you bypass the downstream injector for more flow and pressure. It also alows you to rinse at a lower pressure without the activating the downstream injector. It is always recommended to still rinse your downstream injector after each use to extend its lifespan. 
 
Comes with Stainless Steel fittings and a downstream injector of your choice. 3-5gpm or 5-8gpm.