Unaflex "SUPREME" Style 189 Lightweight Rubber Expansion joints are available in round, or rectangular with arch, configurations.  They are recommended for pressure and limited vacuum applications such as air, gas and water service where pressures are slight and duty not severe.

They feature a lighter wall and flange thickness to provide extreme flexibility.  Their duck plies are reinforced with steel rings.

Style 189 Joints are also available for temperatures up to 500?F and can be make with sleeve ends.

Max operating pressure for all sizes is 25 psig internal pressure and 15 inches of mercury vacuum.