Product Description 49D4 VELVAC BOOSTER Primarily used for vacuum over hydraulic brake trailers and tag axles. Velvac #184014, 49D-4
C3503, Master Cylinder C3503, Master Cylinder 5/16" and 1/4" Inverted Flare Ports. Casting # 300406C.
C3510, Master Cylinder C3510, Master Cylinder 5/16" and 1/4" Inverted Flare Ports. Casting # 300406F.
C3496, Master Cylinder C3496, Master Cylinder 5/16" Inverted Flare Port. Casting # 300358. GM Application.