Review on 🚤 High-Quality 8mm 5/16 Black Primer Bulb Rubber Fuel Pump: Ideal Marine Boat Accessory for Efficient Fuel Transfer by Jason Paredes

I like the quick delivery and easy returns. I ordered 5/16" primers and received 1/4" primers. Either the storage location is wrong or the items are sold out. I have ordered and returned an order and requested a replacement of the same item and from the same supplier. The second order didn't work either. 5/16 is the inside diameter (the inside measurement of the two stems at each end). The 5/16 rods go from the gas tank to the 5/16 pipe, the pipe to the water separator, and from the separator to the engine. It is important that the size fits. The 1/4" piston is smaller and offers less volume.