The Ridgid 66133 MegaPress Ring is designed for use with the RP 350, RP 351, RP 342-XL, RP 340, 320-E, CT400 Standard Series Press Tools (not included) in which it will press fittings created by the MegaPress tool onto pipe 1 inch in size. This ring requires the 21878 V2 Press Ring Actuator (not included) for actuation. The flameless system eliminates the need for hot work permits in which valuable time can be saved by the process of press connecting carbon steel pipe.