![]() PRICES - Although we make every effort to assure that our prices, products and coupons are advertised as accurately as possible, we are only human, and in the event an error is made, we reserve the right to correct it. No use on prior purchases after 30 days from original purchase or without original receipt. I bet you could collapse something like this with no effort.Original coupon only. Thin wall tubing- you can see how it is distorted sitting under its own weight. Full vacuum is one atmosphere or roughly 14.7psi. Look at the tubing and if it is thin wall or easy to collapse with your fingers, it will collapse under vacuum. Most of the tubing available at your local hardware store up to about 1/2" i.d. HDPE will be stiffer and not drape as well so another option that is semi flexible and will be moderately drapeable is LDPE. tubing or, at least, pay attention to the wall thickness. To your point, I would look at a reinforced tubing or a HDPE tube if you want to go with a much larger i.d. I also use this tube for other projects so I knew it would work for my scenario. so it has some decent wall thickness for the size of tube. The best part is this unit is serviceable with parts available at any hardware store! No special fittings or connections and it can be adapted for many other engine or machinery as long as what you are extracting is compatible with the tank and hoses.Įxcellent question. For comparison I also drained the transmission in about 60-90 seconds. I suspect that if I had the hose running through the bottom of the hull with a 3/8" hose l, I could drain it in half the time or better. This still far outperforms most store bought systems in the current configuration. Next I will be changing to a 3/8" i.d. barbed fitting, on the fluid side only, to match the factory hose and I will be adding a hydraulic quick connect so I can switch back to the 1/4" tube for the lawnmower, trimmer etc. I know the unit can move much more volume because I can shut off the vacuum pump and the residual vacuum in the tank will keep pulling oil for an extended period of time. The results were outstanding! I drained the engine in about 12 minutes with no mess and not a drop of oil anywhere.even when I drained the tank. Keep in mind the engine was cold and I was pulling though a 1/4" hose, up about 4 feet of elevation. The pipe is 4" PVC with a flat bottom cap. This sits on a 2" to 3/4" threaded PVC reducer and is connected to a 4" to 2" adapter. On the top I have a 3/4" ball valve for draining the tank with a brass hose cap for cleanliness more that anything. I added a 1/4" FIP barbed fitting to connect to the factory drain hose on my Malibu as seen below. I drilled and tapped with a 7/16" drill bit and a 1/4 NPT tap. I used 1/4" tubing and 1/4" barbed MIP (All 1/4 NPT threads) for the vacuum and extraction lines. I already had the pump which I use for other things but it was this that started the gears turning. I used and inexpensive 2.5 CFM vacuum pump from Harbor Freight which you can find for around $85.00. Using PVC pipe, caps and some brass fittings this is what I came up with. In my quest to reinvent the wheel and after reading so many negative comments on a variety of fluid extraction units, I designed my own.
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