Mityvac Mv7300 PnEUmatic Air Operated Fluid Evacuator With Accessories For Draining Engine Oil Or Transmission Fluid Directly Through The Dipstick Tubes

Used this tool a few times already to service a power transfer unit and rear differential. My vehicle does not have drain plugs for these gear boxes (only fill plugs) and the manufacturer claims the fluid inside is filled for life. There are many documented cases of mechanical failure due to lack of maintenance with this particular set up so i decided to purchase a fluid evacuator to facilitate some sort of maintenance. This one was not the cheapest one available but i figure i have already covered the cost with the number of jobs i have done with it. I do have the luxury of being able to hook up to shop air so i have been quite satisfied with its performance.

I used this for the first time today. I had to get a air line adapter and then hooked it up to do an oil change. I had the car our for 5 miles, came back and started the job. First the air drag on this item you really need a large air compressor. I don't recall seeing any cfm ratings but I have a 130# 30gal tank which is probably larger than most people. If I had a pancake or cheap compressor I think this item would not do you justice. My compressor was cycling on about every 3 minutes with this thing running with a 100 lb regulator and pressing back up to 100. The air flow to get this drag is considerable so if you have a low CFM rated compressor you will not have good results. I also noted the tube lengths. I have read about he tubes connecting together but I opted to just go up to the big box hardware and you can get 25ft of 1/4" polyethylene tube for under 3 bucks. No sense in adding connections to the line. The connecting of tubes also allows for air leaks so when you consider the best vacuum, the less connections the better. The next thing is the drain plug. It was hard to remove when new. I got it open and used some silicon lube spray to get the o-ring lubed up. Again for good vacuum this o-ring needs to seal the top of the container to get that suction. Now I hooked up my air line, running on a regulator at 100#. It was pulling that oil out of the drain plan with good pull. The weather here was 45-50F and it took me about 45 minutes to pull 4 qts of oil. No mess, very simple to do. I had the drain cap off to prevent vacuum in the engine. I would imagine in the summer weather I'd get a better drain rate but it did the job. Now just have to take the oil to recycle and I'm good to go. Overall I think the product is good and can help with a lot of maintenance on a car or small engine. The length of the tube is really the low point in the design especially when the big box hardware has them for around 3 bucks. I have a few more cars to use it on but it was nice while I was out today, I was able to drain and refill the power steering reservoir in about 2 minutes.... I'm guessing the oil in there was from 10+ years ago. those who had bad luck I would consider the seals of the container, the o-ring at the drain top, the hoses and fittings and do you have the proper air compressor to really run this. The directions are not very telling so it's a learn as you go. I'm guessing that in 3-4 oil changes I'll be ahead having bought this.

This pump works great. I've used it on both cars and machinery, including drawing nearly 10 gallons of hydraulic fluid on one job (Emptying between pulls, it holds about 2 gallons which is enough to empty my cars and boat in 1 pull). I have a smaller, 2.8 CFM Bostitch compressor. It runs constantly while extracting but the rate of extraction is fine. Maybe 5 minutes for 2 gallons. For oil changes I no longer need to jack or use ramps, no laying on the ground, no oil running down my arm or dropped drain plug searches in spent oil, and no more crush washers! I have a manual pump I used on my boat, which is a bear to pump and leaks constantly. I'm donating it and good riddance. If there is any downside, it is the size, as it takes more space on the shelf. But I feel relief when I see it there! It also does not come with a quick disconnect, which is disappointing given the price point, so I had to pick one up to attach my compressor (Air Hose Fittings and Air Coupler Plug, Air Compressor Quick-Connect MNPT Male Plug). This unit comes with suction hoses of various sizes, it's clean in operation and has a pour spout for transferring spent oil. You need it!

Works awesome. Definitely should have had this years ago.

Used these daily at work for years. Great product. They are reliable and easy to use.