... and Flange Assemblies Size: 2",2.25",2.5",3"3.5",3.75',4" SS304 & Mild Steel,these are top ... the GT42, GT42R, GT42RS turbos. For an instance,3.5" Vband machined flange allows typical weld on application ... the extra length and lip built in as a 3.5" hose slip on (has the proper width for a ... has a nice inside smooth taper following the compressor discharge. Flange is O-ring grooved and o-ring provided ...