A couplings are used to connect two pipes to each other. If the material and size of the pipe are not the same, may be called a reducing coupling or reducer, or an adapter. The term expander is not used for a coupler that increases pipe size; instead reducer is used. It is used to connect two identical size tube together. The coupling used to connect two pipes of different diameter is called a reducing coupling.
Coupon Validating Machine is used for automatic time stamp on salary muster card. The feature includes microprocessor based control, Y2K real time clock, automatic red/blue colour change for late marks, fully programmable, time synchronization from master clock system and programmable siren control.