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Yesterday I got the idea to make a tube that pumps balls only and had success!

I found a half gallon jar with a smaller opening that a STJ.

I got a used Poly vinyl seal and cut it to fit the rim. I had to cut about ¾ of an inch to make the end meet.
Then put this on the jar rim and sucked the air of the tub and pulled the boys in (with some real serious effort.
This was a n amazing pump last night.

I’ll try to post pics this evening.
It was two of the best pumping sessions ever and really isolated what I wanted to pump.

i am waiting for the sealant on my new 3.5 inch jar to dry for the express reason of pumping just the boys. i will post pics when i get to use it

Would love to see how you both are doing with that, could help me with my goal

Here is what all the parts look like
Splitting the ring makes it possible to get it off easier.
I pumped to over 14" in an hour...less?
Sack hangs below cock after pumping.

I have used this three times and the first and third time it was amazing.
The second time I couldn't get a decent seal around the suction hose.... but i got that figured out.
Today pumped balls up to 14" dia. without having to pump cock. I pumped in my ASTJ last night and tooo long. so cock was kind of sore.
After 5 sessions of 15 min each it looked like i had the jar half filled.
I might have a couple of extra days off coming up and want to try this way more often. but for less time.
The ball only chamber on pumptoys looks interesting . I just worry about my cock being sucked in with my balls.

Interesting! I hadn't thought about cutting the seal like this to make it easier to remove at the end of a long successful session. Does the slit in the seal cause any trouble with keeping a tight suction, though? I'd imagine the slit may cause some slight amount of suction loss?

The cut causes no loss of pressure. Which surprised me. I wouldn't have tried this on my nice silicons seal.
I had to cut it to fit the smaller opening on the jar. It's smaller than a STJ.
This is why i can pump balls only.

I put the seal in place on the jar and then tape around the outer edge with a couple of wraps of athletic tape. This pushes the ends together to make a good seal.
Then I enter the jar one of two ways:
"pop" or slide my balls into the seal and then put it back on the jar.
or
Put the seal on the jar and use negative pressure to pull them inside. This takes lube and lot of suction.

i pump wet and its easy to get water in the jar with negative pressure also.

The only downside this time is that i was left with an indentation from where the tube was pressed between the jar and my skin.
I managed to touch all 4 sides of the jar and it took some doing to get out even when the seal was removed.