•  Two rollover valves and a check valve (two-way) are built-in. For the rollover valve and the check valve (two-way), refer to the emission system. (See ROLLOVER VALVE FUNCTION [L8, LF].) (See ROLLOVER VALVE CONSTRUCTION/OPERATION [L8, LF].) (See CHECK VALVE (TWO-WAY) FUNCTION [L8, LF].) (See CHECK VALVE (TWO-WAY) CONSTRUCTION/OPERATION [L8, LF].)