Kevko Breather tank has an internal baffle, #12 AN fitting, 1/4″ pipe bung with drain petcock. Comes complete with B100 1-1/2″ breather & hose clamp. Tank mounting holes are 6-1/2″ apart. Tank dimensions are 4″ wide, 5″ tall, 3″ deep. Easily mounts to firewall. Great way to clean up leaky valve cover breathers and messy engine compartments..