Master Cylinder (vacuum brakes)

[GNasty]

I haven't had any problems with my vacuum brakes, other than the fact that I keep getting leaks from these 'remanufactured' master cylinders I keep buying. My second one is leaking between the master cylinder and booster. This time, I'm buying 'new'.

Is this one from NAPA quality?
http://www.napaonline.com/Catalog/CatalogItemDetail.aspx?R=NMAM2477_0358759920

Thanks