They also feature 3/16 compression fittings that can be used with hard line or with poly line. The Pro Race Fogger kits come with a new Pro Race nitrous solenoid that features a new proprietary plunger material that resists swelling, yet seals as good as a Viton® type material. The nitrous solenoids also feature new blue powder coated housing where the Cheater fuel solenoid features red powder coated housings for easy identification and good looks. The new Pro Race Fogger System has had many hours of R&D at the race track which equates into new track tested tune ups. The Pro Race Fogger is for the professional nitrous user and is capable of providing an additional 500 + HP. The Pro Race Fogger comes with new improved solenoids, stainless steel hard lines, distribution blocks, jetting and hardware. Available separately, NOS offers electrical wiring kits and bottle kits in a variety of combinations so you can make up your own custom kit combinations.