5 Bottles of Concentrated Sealing Solution (Makes 5 Gallons) Compare To Pitney Bowes EZ Seal, pitney bowes sealing solution, ez seal sealing solution, envelope sealing solution High Performance Concentrate Sealing Solution (Five) 4 Oz. concentrate bottles make five gallons of sealing solution. One of the oldest and most trusted formulas on the market for: High speed inserting, envelope sealing, stamp affixing, or packaging tape dispensing. A combination of active ingredients fight bacteria and algae growth. A Top Value For: high speed inserting, envelope sealing, stamp affixing or package tape dispensing Compatible with any machine that seals envelopes