Does pumping make the penis permanently bigger?

No good evidence supports permanent growth from pumps. Most users see temporary engorgement that fades within hours. Pumps are better known as an aid for firmer erections than as an enlargement method.

How is this different from an electric pump?

This one is manual: you squeeze the pistol grip to create vacuum. Electric pumps hold a set pressure with a motor and often include a gauge, while this needs hand effort and gives no pressure readout.

Is there a pressure gauge?

No. You judge vacuum by feel, so go slowly and release pressure if it feels uncomfortable. A gauge on rival pumps makes it easier to repeat a safe level.

Wash the cylinder and sleeve with warm water and a sex-toy cleaner, then dry fully before storing. Keep the pump mechanism itself dry.

Who should avoid using it?

Anyone with a bleeding disorder, a history of priapism, or recent genital surgery or injury should check with a doctor first. Stop if you feel pain or numbness.