This tricky little item is a replica of an Enderle square barrel valve. When running an EFI system you must have a throttle position switch (TPS), this switch is connected to the throttle linkage and lets the computer (ECU) know were the throttle position is. We designed this block to hide the TPS switch and complete the over all look of the EFI system, after either braided hose or stainless steel line is connected it really looks like you have mechanical injection system. The wiring from the TPS is run through the line and around to the back of the injector.