FILL-TROL® is a combination of an EXTROL® expansion tank and a specially designed automatic pressure reducing valve. Together, they manage water expansion to provide satisfactory heating system performance.
The EXTROL is pre-charged at the factory to 12 PSIG and is ready to install in most residential and light commercial systems without adjustment. The valve is designed to fill the system with water and automatically shut off the flow when it reaches the precharge pressure in the tank. It will also restore the system to 12 PSIG if the pressure drops below that point. The precharge may be changed to set the desired fill pressure.
Q & A: Ask the Questions, share answers
Do you have questions about this product?