Victor 0381-1621 ST900FC Torch Assembly (Boxed) comes with built-in patented flashback arrestors and reverse flow check valves for added safety as well as a hose Connections are 9/16 to 18 inches unless noted. The cutting tips are compatible with the series 1 Type: 101 101-30 degree 101L 108 110 112 118 303MP GPM HPM 318MP 303MP GPP HPP 318MP 200 200L GPN HDN HDNL MCN CSN HPN HWN 207 218 234 244 GTB. This torch assembly is for heavy and medium duty industrial applications. The gas type to be used with this system is an fuel gas type 5 PSIG and above.