The Groth Models 12F-TSW PVRV spring loaded design was created to exceed

industry needs. Extensive research and development have produced a product that

achieves both superior sealing performance and industry leading flow rates, while also

allowing customers to reach required flow with a potentially smaller sized valve. The

pressure/vacuum relief valve is designed to protect your tank from damage created by

overpressure or excessive vacuum. Costly product evaporative losses due to normal tank

“breathing” are greatly reduced. The Models 12E-TSW & 12F-TSW are superior sealing

valves developed to minimize fugitive emissions while providing increased protection and

safety to tank equipment and on-site personnel.