The Physics of Water Pumping

Yes. the Utube is the basic way of operation. I am sure Mr Fantastic will write more authoritative on this. You can part fill the cylinder to speed up the process but it is unnecessary. Can be done cleanly with bno water mess by pumping from the container at the start and pumping back into the container at the finish with the leak valve fully open. Not sure of the max vacuum but I think it goes well above 15” To some extent it would depend on the leak rate you use.

20 hg is the max just found out I’m keen on buying if it’s not so loud

After reading The Physics of water pumping, and re reading it again , I also am inclined to get out my Bathmate and do water pumping again.

I have been lazy , not doing any PE work for the past 6 months, and have been focusing on foreskin stretching. The Bib starter is in the box and hasn’t been used much since. Had been hanging 5 lb. in 3 sets twice a day for 5 days a week with weekends off for resting.. Got to start again. C..

Get out one or the other and go for it! :)

Glad you enjoyed the thread.

Upon request from another member I am uploading step-by-step pictures and instructions on how to set up a water pump using a brake bleeder.

Photo 1: Here are all the parts laid out to construct a water pump using a brake bleeder kit, a standard clear acrylic pump cylinder with a quick disconnect valve, and a male barbed quick disconnect piece. These three things must be purchased separately unless you already have a pump kit with a quick disconnect, in that case you probably have the last two pieces already and just need the brake bleeder kit.

Here are the individual parts and where they came from, from right to left:
Brake bleeder hand pump with gauge (brake bleeder kit)
A short piece of tubing cut to about 6” (brake bleeder kit)
Brake bleeder reservoir cap above brake bleeder reservoir (brake bleeder kit)
A long piece of tubing cut to about 18” (brake bleeder kit)
Male barbed quick disconnect (purchased separately - I’ll post links below)
9x2.25” pump cylinder (purchased separately)

Photo 2: Here are all the parts laid out to construct a water pump using a brake bleeder kit and a shitty, cheap tube that does not have a quick disconnect.

Here are the individual parts and where they came from from right to left:
The brake bleeder hand pump with gauge (brake bleeder kit)
A short piece of tubing cut to about 6” (brake bleeder kit)
Brake bleeder reservoir cap above brake bleeder reservoir (brake bleeder kit)
A long piece of tubing cut to about 18” (brake bleeder kit)
12x2.25” pump cylinder (purchased separately)

Note: the pump cylinder in Photo 2 is opaque. NEVER use an opaque cylinder. I am just posting it to demonstrate how you would construct a water pump if you had a similar cylinder that was clear laying around.

Photo 3: Step 1 - connect the reservoir and reservoir cap. It twists down onto the reservoir like a child-proof prescription bottle cap.

Photo 4: Step 2 - connect the short length of tubing to the brake bleeder hand pump by pressing it over the hand pump’s barb. If this is difficult, running the end of the tubing under very hot water for a minute or two will help loosen it up so it slides on easier.

Photo 5: Step 3 - connect the other end of the short tubing to one of the barbs on the reservoir cap (doesn’t matter which one).

Five pictures max per post, I’ll continue below.

Photo 6: Step 4 - connect the long piece of tubing to the other barb on the reservoir cap

Photo 7: Step 5 (setup 1 only) - push the male barbed quick disconnect piece into the other end of the long tubing

Photo 8: Step 6 (setup 1 only) - push the other end of the male quick disconnect into the female hole on the top of the cylinder. They will snap together easily with an audible "click." You are now ready to pump.

Photo 9: Step 5 (setup 2 only) - as there is no quick disconnect in this setup, you can push the barb on the top of the pump cylinder right into the other end of the long tubing piece and then you are done.

Where to purchase male quick disconnects:

pumptoys store

United States Plastic Corp

Fresh Water Systems

Note: on the last two links I can’t remember if you need a 1/4" ID or 3/8" ID connector. They are both under a dollar on both sites though, so I would just purchase both sizes to be safe. :)

just bought a cheap pump off of ebay to use in the shower for some water pumping, I did it before after reading this thread I think I will carry on as seems to be a safer surer way of making gains

thanks for the great article!

will complement with air pumping also!

The oldschool pump! Be careful not to overpump without a vacuum gauge. Those work well for pumping 100% water, with no air in the system.

Nice snapshots and description. :) Might try water pumping this week. This might be a ridiculous question, but the reservoir, I mean do you fill it up with warm water? I’m slightly confused.

Hi NakedTom, hows the pumping going?

I think you fill the cylinder with water and any excess water that gets pumped out will fill the reservoir chamber so is like an overflow.

I think thats how it works I may be wrong!

Thanks Roots yeah I had an oldskool one before using it just for water pumping and still got massive doughnut, with experience now I know to go for slow and low pressure to build up over time. Is a marathon not a sprint as i learned through trial and error!

So what’s the opinion on a little bit of air in the tube. I try to get 100% water but sometimes a few bubble will sneak in. Should I start my session over at that point or not worry about a little air?

I always find that you are going to get air in the cylinder (Well I do anyway) even if I fill to the brim, then water ends up getting pumped out and replaced with air, I dont think this is a bad thing and is expected. As long as you got lets say 90% water with a little air filling up the 10% at the top of the cylinder then only air will get pumped out and the density/ pressure of the water increases gradually!

Cheba is correct, reservoir remains empty and catches the water you pump out. If you fill it, you can quick disconnect from the cylinder which causes the cylinder to seal, remove the reservoir, empty it, reattach it, and plug the male quick disconnect back in. This will usually cause a couple air bubbles into the tube, just point the tube up and pump the air out first.

The reservoir is just there so you don’t get water in your hand pump, which will corrode it.