| SBO | to prevent gravity circulation |
| RK70 | especially suited for heating and hot-water installations. |
| RK71 | for liquids, gases, vapours. Application as gravity circulation check, vacuum breaker, breather, foot valve, pressure-relief valve or pressure-maintaining valve. |
| MB14 | for liquids, gases, vapours. Application as gravity circulation check, vacuum breaker, breather, foot valve, pressure-relief valve or pressure-maintaining valve. |
SBO, RK70, RK71, MB14