VdS: for use with VdS approved pipe couplings in fixed water extinguishing systems
FM: for use with FM approved pipe couplings in fixed water extinguishing systems
UL: only for use with UL listed PicoFix pipe couplings LPCB: only for use with LPCB approved PicoFix pipe couplings in fixed water extinguishing systems; use with LPCB approved Shurjoint pipe couplings is allowed