Rota-Lift and Rol-n-Rap style flasks Aluminum Cast TIGHT FLASKS For Conventional Molding Wherever you find Rota-Lift and Rol-N-Rap Style molding machines, chances are you also... find HINES "POP-OFF" flasks. These rugged quick return flasks are specially engineered for this type of operation and add to their capability for molding accuracy, high production... and fast pattern changes. "POP-OFF" flasks are made in all sizes for use on all models. Vented concave wall construction provides rigidity and eliminates the need for sand strips. ...