Product Description 49D4 VELVAC BOOSTER Primarily used for vacuum over hydraulic brake trailers and tag axles. Velvac #184014, 49D-4
C3507, Master Cylinder C3507, Master Cylinder 1/4" Inverted Flair Port. Casting # 300455. Ford Application.
C3496, Master Cylinder C3496, Master Cylinder 5/16" Inverted Flare Port. Casting # 300358. GM Application.