Designs, builds custom hydraulic kits to run attachments on excavators, backhoes. Quotes given. Georgia, USA. HydrauliCircuit Technology (HCT) has been a leader in producing high quality, durable and easy to install auxiliary hydraulic kits for excavators and tractor-loader-backhoes. Our strong engineering capabilities allow us to design and produce kits to operate almost any attachment, on virtually all excavators and backhoe/loaders.