Fireboy SV-1 Solenoid Valve. The SV-2 is a 1/4 solenoid valve for use with C-1, S-1A, and S-2A. It opens the flow of propane when powered and automatically closes with low or not current for added safety. /4 female NPT inlet, 1/4 male NPT outlet. 12 VDC. Rated for 0-312 psi and UL Listed. Includes one 3/8 Male Flare x 1/4 Female NPT brass fitting (PF-5446).