switch and bait read it to make sure you get the right one loading it is actually pretty simple once you figure it out not work and will not pump grease out it sucks in too much air save your money and go good grease gun quality product works just wish the grease would stay in the gun four stars for the price this is a great grease gun buy it and if you dont think its the best ill buy it from you love stoners products if you like stoners glass cleaner youll love this as good as my truck looked this made a huge difference