Just press the small button between the load hooks into the quick coupler to relaese the attachment.
Your attachment won´t move unless You unlock it.It is held securely by two small specially shaped metal pins.You don´t have to modify the bucket cylinder to use this quick coupler like you do have compared to other products on the market. Push the small button and these pins and the hydraulic connector will move into the quick coupler and release the attachment.You don´t have to pull any pins or disconnect hydraulic lines. Change Your tools within seconds.It is really that easy!