Thebishop - that’s really helpful. I just found the “instructions for use” summary. It seems as if it is designed so that you can’t overpump. Does that sound about right?:
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How to use the bathmate1) Fill the bath with water
2) Once your in the bath put the Bathmate under the water until it completely fills full of water, then whilst it is under the water put your penis inside it.
3) Push the bathmate down towards the pelvis area several times until you create a vaccum. You should start to feel the pressure building up. Surplus water starts to be realeased from the pressure release valve at the top of the bathmate. You may have to pump it down four of five times until no more water comes out the pressure release valve.
4) Once you cannot pump down any further just relax for 5 mins. Whenever you cannot pump the Bathmate down any further this is the optimum vaccum at that particular time.
5) Every 4 or 5 minutes try pump down again. As your penis is expanding this will force excess water from the top of the Bathmate everytime you pump down. But you will always reach a point where you cannot get any more pump.
6) Pump the Bathmate to its optimum vaccum when you feel necessary. This is the stage where no more water comes out the end when you try pump down.
7) If you feel the pressure is too much just lightly press the pressure release at the top of the Bathmate. This will release pressure. After 15 to 20 minutes release the pressure by pressing the pressure release at the top of the Bathmate and take the unit off. Do this stood up in the bath so you can see the results straight away. You wont be dissapointed
8) We recommend between 15 to 20 minutes per session. Use the unit as often as once a day but no less than three times a week for best results.