Ritchie Engineering Co., Inc. / YELLOW JACKET 77930 Max-Flow Deluxe Oil Pump

I’ve had several of these in my refrigeration warehouse and this is just like the others. They lasted many years. Just wanted to replace a crappy Vilter branded hand pump.

Great pump, durable, this requires an adapter to reduce down to 1/4 if needed. Pumps 3.8 oz. (112.38 ml) per stroke and will pump against 250 psi pressure.

Well made tool from YJ

I've had this YJ oil pump for several years and have found it to be very decent overall. I generally prefer this foot stand type pump to their other can top pump for the small amounts of oil I usually need to deal with. It was more expensive than the other model, but I just find this one to be a more versatile as a self-contained unit.YJ says this pump is rated to move a max of 3.8 oz with each stroke, so it also has a higher oil volume than their can top model. It generates a lot of forward pressure to force oil into a system and you can sometimes use a hose or dip tube and the pumps reverse suction to pull old oil from a compressor instead of having to remove and tip the compressor to drain it. The pump came with a U-shaped piece of copper tube with a 1/2" flare fitting on the inlet port that can be slipped down into to an open quart or gallon size can of oil or you can remove it and add your own fitting to use the pump with flexible tubing or hose. It also came with a 3/8" flare fitting on the outlet port, but I bought an adapter so I could use it with a standard 1/4" refrigeration hose. YJ sells 3/8" and 1/2" flexible hose kits for the pump, but it's easy enough to just make your own with some barbed fittings and flexible tubing.