Veeder-Root 330843-001 Six-Input Pressurized Line Leak Interface Module is for use with PLLD controller module. Maximum of One per console for use with PLLD Controller Module. PLLD supports a maximum of six line leak detectors in each console. TLS-350 series consoles require both a PLLD interface module and a PLLD controller module to perform line leak detection. This pressurized line leak interface module is a low voltage compartment that works with the TLS-350 and TLS-350R. One module has inputs for up to six line leak detectors in each console.