Ace Race Parts 24025 1.750 Flex Bellow (with Inner Liner) x 2.500 Overall Length - 321 StainlessAce Race Parts 24025 1. 750" Flex Bellow (with Inner Liner) x 2. 500" Overall Length 321 Stainless FEATURES 100% 321 Stainless Steel Construction 2 Ply Bellow Design Slip Fit Connection Type (must be welded) Directional Smooth Bore Inner Liner Extremely Durable in High Pressure Applications Pressure Tested (data listed below): 145 psi @ 68 DegreeF and 72. 5 psi @ 842 DegreeF Helium Leak Tested Prior to Shipment Ace Race Parts 304 Stainless Steel Flex