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How
to Make
your Own Sun Tea Jar (STJ) Penis &
Scrotum Cylinder
An
"STJ" refers to a combination-style
(penis and balls) pump, made from what is called
a "sun tea jar". It's a housewares item,
sold at Wal-marts, hardware stores and grocery
stores all over the country. As glass products
go, it's made heavier than most. The jar is used
to make iced tea, by filling it with water and
tea bags, then letting it sit in the sun for a
few hours. It's usually not available in the winter,
but found readily in the spring and summer.. iced
tea season. Thousands of these jars have been
made into inexpensive pump cylinders. Pumptoys
gives you two alternatives in making an STJ. One
is a "Conversion
Kit" that takes all the work out
of it, and costs a little more. But this article
covers doing it from scratch- so here's how it's
done!
Materials
list:
-
1 sun tea jar. (we used a 3-qt size) Source:
Walmart. Cost: $1.88
- One
plumbing fitting, describe as: A straight female
connector, 1/2" female iron pipe to 3/8"
OD compression. Source: Ace Hardware, Ace part
#40319 Cost: $2.59
- One
"Support Insert", which is a small
piece of 1/4" OD brass tube that comes
with many compression couplings. It is designed
to support the inside of soft plastic tubes
when they are used with compression fittings.
Without this, the vinyl tube may pull out easily,
and the connection may not be airtight. This
fitting usually DOES NOT come with the plumbing
fitting described above, so you may need to
buy it separately.
- 3
feet of clear vinyl tubing, 1/4" ID x 3/8"
OD. Source: Ace Hardware. Cost: $0.51
- 1
stick of epoxy putty, Ace part #4027116. Cost:
$3.79
Total
cost of parts of our STJ- $8.77! Here's the parts
picture:
We
need to modify the valve that came with the jar
to accept the tubing. This is accomplished by
bonding the female connector to the valve outlet.
The connector is threaded; the valve outlet is
not- but it's a tight fit.
First,
you need to remove the valve and inspect the jar
carefully- it is glass, and may have flaws.
- Remove
the valve from the jar by unscrewing the plastic
nut inside, then pulling outward.
- Remove
the rubber gasket from the valve opening by
pushing the side of the gasket toward and then
through the hole.
- Examine
the rim of the valve hole and the top rim of
the jar. You are looking for small cracks, which
might become big ones under pressure.
If
any such flaws are found, or if the top rim has
sharp edges- replace the jar.
Here's
the valve out of the jar body:
Next,
we'll modify the valve.
- Using
sandpaper or an emery board, roughen the exterior
surface of the valve on the outlet end.
- Mix
a small amount of the epoxy stick putty. No
more than a small marble in size is needed;
mix throughly.
- Rub
a coating firmly around the roughened area of
the valve, working it down to a layer about
1/16" thick.
- Rub
a coating inside the threaded fitting end, filling
the threads- but not leaving excess. If you
squeeze epoxy into the valve opening, it will
interfere with valve function.
- Insert
the valve into the fitting. Turning will allow
the threads to grip the fitting.
- Wipe
away any excess epoxy around the outside of
the fitting.
- Set
this aside and allow it to harden fully.
Note:
There is a curved extension on the valve, a finger
grip. In some valves, this grip bevels down the
side of the outlet more than others, and may need
to be trimmed back by filing in order for the
straight connector to fit well.
The
assembly should look like this:
After
the valve assembly epoxy has hardened, we can
add the tubing.
- Remove
the small nut from the fitting, and look for
the small compression ring inside.
- Push
the support insert into the end of the vinyl
tube.
- Slide
the nut over the end of the tubing, starting
on the smooth side of the nut.
- Slide
the compression ring over the tubing until about
1/4" of tube sticks out of the ring.
Insert the tube into the connector fitting.
- Slide
the nut down and tighten, making about one turn
with a wrench after it becomes finger tight.
The
valve unit will now look like this:
Now,
we can assemble the STJ.
- Install
the rubber gasket, by folding it in to start
and then pushing into place.
- Insert
the valve stem through the gasket and tighten
the nut on the inside, a good "finger tight"
will do.
Here's
the valve installed on the jar:
The
STJ is now ready to pump- almost. If you were
to use the jar as it is (and many try) you would
find it quite uncomfortable. The rim is made to
seal to a lid, and we need to do something that
will make it comfortable and help it seal to the
body surface. Over the years since this started,
STJ pumpers have used a wide variety of materials
to make a sealing edge for the jar. Here are some
of the methods I've seen:
-
Wrapping tape around the edges and folding it
in.
- Self-adhesive
foam weatherstriping.
- Multiple
layers of caulking.
- Silicone
rubber spread in the same way.
- Plasti-grip
(a dip used to coat tool handles)
- Doughnuts
cut from sheet rubber.
NONE
of these are very satisfactory- and all of them
depend heavily on the hand skills of the person
doing the job. The seal is a critical part of
pumping, probably the most important. If it leaks,
you will become tired of the hassle. If it's uncomfortable,
you won't spend much time doing it, and time is
what makes it work. As a result of this one issue,
the STJ has always been cheap but not very satisfactory.
To
solve this problem, PumpToys designed a seal to
be produced by an industrial process called injection
molding. For the first time, a professional solution
was created. We eliminated the seal problems,
improved the pump's effectiveness and made the
STJ comfortable and enjoyable to use. the copyrighted
seal configuration. The only seal method that
makes the STJ work well is The PumpToys
Precision Seal, now a copyrighted design.
Here's
the PumpToys Precision Seal in place on an STJ:
Once
you have a seal- the pump is ready to work, and
you are set up for a total of under $40, or about
1/3 of what a two-stage cylinder without a seal
would cost. Oral vac is all you need to get started.
Simply apply suction to the tube while holding
the valve in button in, which keeps it open. Release
the valve and it seals, holding the vacuum. You
are almost ready to go! JUST ONE MORE IMPORTANT
CONSIDERATION!
WHILE
WE HAVE NEVER KNOWN OF AN STJ THAT HAS BROKEN
IN USE- REMEMBER THAT A
THIS IS A GLASS JAR. BREAKAGE CAN OCCUR,
AND INJURIES COULD RESULT IF THAT HAPPENS. WE
DO NOT RECOMMEND YOU PUMP WITH A GLASS CYLINDER,
BECAUSE WE CAN'T TAKE THAT LIABILITY. BUT IF YOU
DO, PLEASE- USE THE APPROPRIATE CAUTION.
PumpToys
makes a pump of STJ size in acrylics. Take a look
at The Acrylic STJ (ASTJ).
FOOTNOTES:
(a) Many types of glue or cement would work to
join the fitting to the valve. Just be sure that
it will bond to both plastics and metal, and that
it's waterproof.
(b)
Clear tubing is advisable, so that you can be
sure the tube interior is clean. This is especially
important if you use oral suction.
(c)
Shaving or shortening of the pubic hair is usually
required to keep a reliable seal.
(d)
Lubricants around the seal area make pumping more
comfortable and the seal more reliable. be sure
and use a lube that is compatible with your cylinder
and seal materials. Lubes that contain petroleum
or mineral oils or bases will damage both acrylic
products and Pumptoys's seal material! Water based
lubricants, like KY Jelly, will break down if
you are pumping with water in the cylinder. Pumptoys
recommends SuperGlyde, a lubricant specifically
made for pumping that is excellent for this purpose;
it will not hurt cylinders or seals and will not
break down when wet.
The
Bagman from Pumptoys
Developer & Manufacturer of the
BullMasters and the QS-7 Programmable Pump
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