For best installation and performance, try to adjust the orientation of the rebar coupler so that the circular deformations of the rebar are in full bearing contact with the wedge shape of the coupler body, opposite of the screws.

Prior to assembly, straighten excessively bent rebar ends so that proper wedge contact is made between rebar and coupler. BAR ENDS should be straight. For curved rebar with a diameter that exceeds 54 feet, a bar end straightness check is not necessary. If needed, grind-off large shear lips that prevent proper insertion of rebar into the coupler.

For best performance and ease of installation, ADTO GROUP recommends the use of a 1-inch drive pneumatic impact wrench and suitable socket. Make sure the impact wrench is rated to achieve at least the minimum impact wrench torque specified to avoid stalling. The air supply line should have a minimum diameter of half an inch.

Follow the torque order described. Do not use any other torquing order.

Do not use an open-ended wrench or an adjustable wrench because of the risk of rounding-out the hexagon head prior to reaching the torque needed to twist off the head.

If removal of the center stop is necessary, use a hammer and punch or large nail to tap out the roll pins in the coupling body. 

Replace missing screws immediately with BPI special screws only. DO NOT ALLOW THREADED HOLES TO RUST.

If bars are corroded, removal of rust/corrosion must be performed to the same degree as that required to bond with concrete prior to installing the Zap coupler. Testing of old or severely corroded bars is recommended to ensure the integrity of the adjoining bars and compliance to design requirements.

Last but not the least, consider your own personal safety. Make sure you are securely positioned and that you will not slip or fall during installation.