The lower arm is orange and is located in the bottom bracket of the top base and is held by a lock pin. It moves the upper to and is also held by a thumbscrew to the float arm.
SPI energy free models have a set back seal & drain to help couteract the problems associated with door freeze ups. 23" W x 27" L x 20" H This waterer has a MAX usage of 120 Beef, 50 Dairy or 135 Sheep.
The SPI Insulated Earth Tube conserves the earth ground source heat as it rises up the vertical shaft to help protect the water line from freeze ups. The dimensions of this tube is 12 3/4" OD x 49" tall with 2 1/2" of insulation.
Engineered with the farmer in mind, this waterer allows easy access to the submersible heater, water line, incoming services and provides effortless cleaning; an extremely low maintenance product.