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I'm in a pickle jar now, on my reclining sofa. Hot pad is a must. I have a string around the neck of the jar to my foot. I flex my ankle & pulse my cock & balls & it feels great. Much better than a static vacuum with the jar against the pubic bone. It takes little effort and hands are free to cruise the net. I search the second hand stores for suitable jars.
Here's a Sweet Tea jar from Amazon "Home Essentials & Beyond 2870 Country Lane Sweet Tea Beverage Dispenser 2.15 gal"
It has a longer neck (4.25" opening) so it won't make that pubic bulge. BIG, too.

Here is my contribution. One hour at 3-5 inHg 1gal STJ. My pumping gear. 1 gal STJ, aquarium pump, homemade vacuum manifold which does the vacuum regulation, and vacuum gauge.
The manifold is made from pvc and is hot glued at the joints to stop leaks, also this lets me take it apart to clean then re-glue.

Wow you guys are great. Love those images. And that awesome DIY equipment, really kool.
I got so inspired. Had been lazy since I broke my jar in Apr to find a replacement. Got a small one and into my 3rd half hour over the passed 13 hours. Had to find time inbetween to sneak in half hour sessions.

Gotta like IKEA

I use a plastic jar and a reversed aquarium pump, and when mobile I use the hand bulb to keep the vacuum up. Another shot of the results.

Hi PumpMonkey

Love the pic & set-up!

What IKEA item do you have there? Looks a great size jar & simple set-up!

Cheers

It is the 2.2 l storage jar (BURKEN)... and the pump I use is a modified aquarium pump

Got this vase at a thrift shop today - 50 cents. Picked up some 1/4 inch plastic tubing - 30 cents, which attaches to my brass oil/air pump (from Amazon $20). I lube up my pubes, put the hose in the vase, put my jewels against the mouth of the vase & pump myself in. The vase is 9" tall with 3 1/2" opening & 6" wide. The taper (in & out) really helps entry & exit. The smaller, long mouth really helps smoosh my well-padded pubes. It's comfy - I've been wearing it 3 hours now just varying the vacuum. I like the shaping of this one - pleasing to the eye. I'm not going to drill a hole in the glass; it's simple enough to slip the pump tube in. Also, a hole in the glass might lead to breakage - spooky! For exit, I slip another tube in the vase & a bit of mouth pressure 'blows' me out.

It's so SWELL to see all your JAR BALLPUMPED huge NUTS. When I first started this thread I didn't realize it would have grown into community of encouragement, experiment, and exchange of ideas to get BIGGER BALLS Inexpensively. Here are my recent pics.

If you are IN Hawaii or COMING to Hawaii, please let me know so we could pump and play together. Aloha, bp808

A couple of my recent efforts

My contribution. Pumped and packed full the day after 2L saline infusion. Wide mouthed quart canning jar. Enjoy!

fettes ding

plastic lamp globe for a jar,,,toilet spud washer for a seal

He is some of me packed (sorry about the quality )

Here's some past shots in a pump toys STJ.