This is a New Original AC Fuel Pump Valve Part# 5591860 for many of the 1937-1957 Chevrolet and Pontiac AC Fuel Pumps. The 5591860 Valve Replaced the Part# 1523106.  This is the 3/4" OD Valve. Nice Item to have on hand for your Original Fuel Pump Rebuild Project. The AC Box is Not included. FREE SHIPPING IN THE US.