Using incorrect sealing solutions for your postage meter, folding and inserting machines can damage your equipment. Pitney Bowes E-Z Seal keeps your equipment in mint condition; it's anti-fungal and non-corrosive. By using generic brands or water you run the risk of mould and rust, which can result in having to repair or replace the entire machine. Pitney Bowes E-Z Seal comes in a 1.8L bottle, and each order includes 4 bottles. Buy in bulk for additional savings.