This is a primary dual inlet Holley HOLLEY FUEL BOWL DOMINATOR. But can be used on the primary side of any 4 bbl Holley 4150 Holley 4160 or 2bbl Holley 2300 carburetor.
It is threaded on both sides providing fuel connection from either the left or right side.
Fuel bowl also has accelerator pump location machined.
The difference between primary and secondary is the location of the sight plug screw hole.
This does not come with gaskets or fittings.HOLLEY 134-108