Tank Mount PP125 Series Receiver. 3 1/8" inch bolt circle diameter. 5 Hole configuration designed for 3/16" attachment fasteners.User serviceable with RRK125 Seal Kit, gasoline and ethanol compatible.Approved to FIA Appendix J, Drawing 252-5This product uses a new Viton seal material that is compatible with gasoline, ethanol, E85, methanol, alcohol blends (virtually every fuel except nitromethane).