The male coupler from https://www.lap-dist.com arrived in the mail yesterday. I tried to attach it to the hose that came with my AutoZone MityVac II pump. It was immediately apparent that the barbed end of the male coupler (the end that goes inside the hose) was too small in diameter for the tubing that came with the MityVac II pump. After testing the male coupler with the several short bits of tubing that came with my pump (who knows what the are used for), I headed for my neighborhood Ace Hardware to look for smaller diameter vinyl tubing, male coupler in my pocket. I found a size that fit the male coupler and purchased three feet (priced at $0.23/ft). I then ran into my second problem, the tubing was somewhat small for the outlet end of the pump. I had to jam the vinyl tubing onto the pump, I think it’s there permanently unless I cut it off. Later on last night, I looked at pictures of LAP Distributing’s pumps on their website. They sell a brass trigger pump with a gauge. Careful scrutiny revealed that the tubing on this pump, as well as the connecting outlet end on the pump, seemed to be smaller in diameter.
Next, after the Ace Hardware stop, I headed to my favorite local sex novelties shop to buy a pump cylinder. As it turned out, the smallest size they stocked was a 2" diameter by 9" length (actually more like 8.5" in usable length—they must measure to the top of the quick connector) cylinder. These cylinders have a flared end opening (seal) that has a diameter that is .25" smaller than the cylinder diameter of 2". Against my better judgment, after making sure that my male coupler fit the female coupler on the tube, I bought the 2" cylinder.
I researched the issue of cylinder size somewhat before making this purchase. I did a search on the topic here at Thunder’s Place which led me to conclude that a cylinder width of 1.75" would probably be the best for me. Newart advocates starting with a 2" cylinder, which is considered the standard size, they stated that you needed to have room for expansion. VacuTech and L.A. Pumps (LAP Distributing) indicated that a smaller size would be better to start with.
Late last night, I did a trial run with the new equipment. It was immediately apparent that the 2" cylinder is too big for me. Once I increased the vacuum to 2 or 3" hg, the pressure started to suck the top of my scrotum into the cylinder. Not comfortable and somewhat painful. My dick just seemed to float around in the tube, there was so much room. I could readily see that I had made a $70 investment in hopes for future girth gains.
Most pumping vendors advocate using string to measure girth. I did the string test this morning (I had to use cock rings to get hard enough—apparently not only is there ruler fright, there is also string fright) and measured mid-shaft girth at 5" and glans girth at close to 6". Couldn’t measure base girth because of the cock ring. I have measured at 5.25" girth with a better woodie, using a tailor’s tape, in the past. At this girth, I seem to be in between the sizing recommendations for a 1.5" tube and a 1.75" tube.
I spoke with VacuTech today. The guy that answered the phone was very nice and helpful and seemed to be knowledgeable (he mentioned low pressures, jelquing between sets, etc.). I explained to him my situation, he recommended the 1.75" tube. He also mentioned that because of the flared opening, the diameter is only 1.5" where you enter the tube. Since I’m leaving town next week, I didn’t want to order at this time.
I knew that my second favorite local sex novelties shop carried Boston Pump Works cylinders. These cylinders are really nice, made of Lucite with red ruler markings on the side of the tube. I stopped by there today to see what they had. They had a 1.5" cylinder and a 2" cylinder. The only 1.75" cylinder was packaged with a brass, plunger-style hand pump. After I asked if they had a 1.75" cylinder for sale separately, the clerk made a note to have the owner order that size.
I’m still not 100% sure which is the best cylinder size for me. It seems that I would pack the 1.5" tube easily, the 1.75" tube seems to give me a little room for expansion (enough room that my scrotum will be sucked in?), the 2.00" tube drowns my dick.
I’ve concluded to wait to see if the 1.75" cylinder becomes available locally. Anyone have any advice or recommendations? This is getting expensive and I want to get the right size.