The rubber cuff is too narrow - cut in half and it will work. The pressure equalization button is very unstable. Fine with a manometer.

The seal at the base of the pump is a little too far into the cylinder, so the root of the penis does not get underpressure and does not get enlarged. The ring ... Read more

An absolutely wonderful pump. Gives a very distinct and strong pressure, which my hard-on is a clear proof of. I have good hard-on in normal cases, but wanted t... Read more

An absolutely fantastic product. Very pleased with the result. Got a wonderful hard-on. A big advantage is the seal which gives good negative pressure. Just rem... Read more

Fantastic pump. Gives me a magnificent hard-on and makes my woman so happy. Have recommended Sinful to both male and female friends. Really happy!

The pump is uncomfortable to use, pushes the foreskin way too far back. The money is wasted

The pump surprised us both after the first use. You get quite a lot bigger quite immediately after use. In combination with the penis ring, the pleasure reaches... Read more