Conversion collar

Hi,

I was on the net looking to buy a pump. The majority of pumps seem to start with a two inch cylinder. That makes me feel kind of small, I guess that the 1.75 is more appropriate.

One of the sites sell a “conversion collar”, recommended for newbies to use with the 2inch pumps as it prevents the scrutum being sucked in.
Anyone used something like this before. I searched this forum but nothing caught my eye. Maybe it goes by several names.

Opinions much appreciated.

I’d say buy the right sized tube.
If you don’t do that and go with the bigger tube I’d save my money and:

1- Buy some pipe insulation and use that around the base of your penis to prevent your scrotum from slipping in.

2- Buy weatherstripping (like the kind they put on the bottom of doors) and install it at the base of your tube making the bottom opening a little smaller. This might be a better option as if you stick it to the bottom of the tube it won’t get sucked up in the vacuum but the insulation might.

3- use a cockring at the base of your cock. One of the stretchy ones.
Just some thoughts- I haven’t tried an of them.