Product Description

Robinair air vacuum pump economical unit uses shop air to pull the system into vacuum and includes inlet fittings with 1/4" and 1/2" acme size threads. Easy to use, simply connect back fitting to compressed air source and front fitting to center hose of a standard manifold attached to the A/C system. Units specifications for the drive is compressed air free air displacement at 1 CFM, Venturi Input Pressure is 75 psi, Vacuum Rating of 29.7 in./Hg.

Product Details

• Amazon Sales Rank: #20738 in Automotive
• Brand: Robinair
• Model: 34970
• Dimensions: 5.70" h x 9.70" w x 4.40" l, 2.00 pounds

Features

• Shop air driven, no oil or moving parts to replace
• Rugged Lexan case is both oil and scratch resistant and comes with a convenient handle
• Vacuum Rating: 29.7 in./Hg
• Intake Fitting: 1/4" FPT and 1/2"
• Acme Dimensions: 4-1/2"H x 4"W x 7-1/2"D

Customer Reviews

Surprising performance Not as good as high vac pump but...
This low cost solution to vacuuming an a/c system is a viable option. I was somewhat skeptical being an old a/c mechanic and having always used a robinair high vacuum pump. In a pinch, I needed a low cost way to vacuum and auto a/c system after replacing some o rings so I purchased one of these and was amazed first that it even worked and second that it produced adaquate results to allow me to recharge free of enough non-condensables to get by. The very reason for vacuuming is to remove moisture, air and any substances that are non-condensible within the a/c system. If not removed these non-condensables reduce the performance of any a/c system or even stop it from working.

Now the performance wasn't up to what I could get with my trusty Robinair, but was satisfactory. The water column it pulled was about 23 inches on a my gauges. (My robinair will pull down close to 28 inches). (I think a perfect vacuum is between 28 and 29 inches of water column on a manometer).

I would recommend this if saving money is crucial and you need it for a small job where you don't plan to use it every day. If you leave it running for a half hour or so it should boil off all the water and most of all the other non-condensables inside the system.

Hope this helps.

Works great but needs tons of air
I bought this tool to evacuate the a/c system in my car after replacing the a/c compressor. It worked fabulously. I attached a vacuum gauge and it was pegged to full vacuum for the entire time I had it on. One thing to note is that this tool requires a decent sized air compressor. I have a pretty good sized 6HP 30gal 150psi craftsman compressor and it had just enough power to keep it at around the required 90psi.