Straight Union Coupler 1 pc 

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 used in the diy outdoor kitchen system to connect 2 - 25mm steel tubes together in a straight line.

This is a 3 inch long 21mm tube that you can connect 2 - 25mm tubes together in a straight line.

Just install the 21mm tube half way into the 25mm tube and secure it with a hex head screw.

Then slide the other 25mm tube into place and secure it with a screw.

Presto.  You have just joined 2 of our 25mm tubes together.