Review on Efficient Quart/Gallon Fluid Pump and Hose for Vehicle Oils & Maintenance - Performance Tool W1139 by Justin Coatsworth

The pump works well, ie pumps. But even with double the cap size, it didn't fit my gallon size Valvoline gear oil reservoir. I could still use it but I left it oiled but if it messed up I might as well just leave it on after use. Instead I had to take it out of the oil and wait for the oil to drain (don't spill out of the part of the pump where the spring is) and use the original cap to close it.