Model VXD Double Interlock Preaction System with Electric/Pneu-Lectric Release Glavanized Pretrimmed Riser (PTR) with EA-1 Electric Accelerator and CoilKeeper. Availble in 4", 6", and 8". Pretrimmed Riser assemblies include the model VXD Deluge Valve, riser check valve, pressure switches, releasing solenoid, water supply control valve, grooved connections for installation, and the EA-1 all completely assembled and ready to install into the riser. The CoilKeeper is shipped loose and requires installation. Refer to the trim diagrams for detailed component information.