PFCT-3475 CSST HOSE 3/4X75 by PRO-FLEX. Save 27 Off!. $177.76. Flexible 304 stainless steel with yellow polyethylene jacketing. All hoses clearly marked with gas pressure rating, EHD (Equivalent Hydraulic Diameter). Tested to the ANSI Standards for Fuel Gas Piping System using Corrugated Stainless Steel Tubing"(CSST), ANSI LC-1a-2009, CSA 6.26a-2009, ANSI LC-1-2005 and CSA 6.26-2005.