Ginger huffs and puffs mightily to blow a thick Sempertex 18" round balloon to bursting, managing the considerable back-pressure without a check valve. She even decides to start the double-stuffed test without the check valve, and manages to produce over 2psi to begin its expansion, but soon re-considers that decision, She deftly removes her mouthpiece, snaps on the check valve, and then re-attaches the mouthpiece, and begins puffing away. Her lungs and cheeks get quite a workout, but manages to prevail.

Ginger huffs and puffs mightily to blow a thick Sempertex 18" round balloon to bursting, managing the considerable back-pressure without a check valve. She even decides to start the double-stuffed test without the check valve, and manages to produce over 2psi to begin its expansion, but soon re-considers that decision, She deftly removes her mouthpiece, snaps on the check valve, and then re-attaches the mouthpiece, and begins puffing away. Her lungs and cheeks get quite a workout, but manages to prevail.