For 4" pumps Used in models: GX4B, X4B, XH4B, NP4F, NPH4F, TX4A Genuine Blackmer Part

Rotary pump vanes for 4" pumps. These vanes can be used for petroleum product pumping including gasoline. Blackmer pumps use a “sliding vane” design. By sliding up and down on the vane pins, they save wear and tear on the vane and pump housing. These pumps are very common on oil and gas delivery trucks.