This is a complete dual injection system, that features two 4 oz capacity injectors. Super smooth action. We tested these in our shop, as well as a few forum members, for six months with great results, now it is available to everyone. This is a really slick set up.
Please note: This injector does not use a locking pin to hold the nozzle on. Additional care and awareness should be used when using it. You can see a video of a single injector in use below.