Product Description 49D4 VELVAC BOOSTER Primarily used for vacuum over hydraulic brake trailers and tag axles. Velvac #184014, 49D-4
C3502, Master Cylinder C3502, Master Cylinder 5/16" and 1/4" Inverted Flare Ports. Casting # 300407C.
C3472, Master Cylinder C3472, Master Cylinder 1/4" Inverted Flare Post. Casting #'s 300206G, 300371. Ford Application.