The Qwik Trik Racer Safety Coupler makes connecting and disconnecting your in car racer safety a snap !! This is the female coupler and will attach to your existing -8 A-N style line. It will require adapter 19899 to be added if you already have a male -8 racer safety on your bottle in order for our couple to fasten to it. You can also replace your current racer safety with our 19898 adapter as well. The 19898 can also be ordered on new I-S bottles at time of purchase for NO additional cost. The picture shows the coupler as well as a 19898 adapter with pressure relief disc. The 19898 is NOT included in the price of the coupler.