5/16-18 x 1in. Long Hex Head Cap Screw Prem B Vapor Return Line Assy. H413B-R-V1 & H426B-R-V1Prem C 30in. & 45in. Motor Assy. Prem B Meter & Hydraulics Assy. & Variable Blender System & Electronic Blender System & Modulating Blend Valve Assy. & Suction Sy