Fire-fighting units with electric motors that comply with UNI EN 12845 and UNI 10799 standards. The firefighting units S4, SS6, SS7, SS8 are designed for automatic systems equipped with sprinklers and hydrants. Pumps entirely in stainless steel in versions SS6, SS7, SS8. The main and pilot pumps are supplied with 15 meters of power cable. The switchboards are already mounted on a stand for a faster installation. Submersible pumps 4", 6", 7" or 8". Pumps with radial impellers, pump and motor coupled directly via rigid coupling. 4" pumps with impellers and diffuser in technopolymer. 6", 7", 8" pumps with diffusers, impellers, delivery and suction section supports made entirely of stainless steel (AISI 304 or 316 depending on the model). Integrated non-return valve to reduce pressure drops. Stainless steel filter applied to the suction mouth to prevent the entry of dissolved solid bodies. GAS threaded delivery port. Pre-assembled manifold with flanged connection for each pump. The pressure gauge, the pump running signal pressure switch, the check valve, the butterfly shut-off valve, the galvanized steel delivery manifold with pressure gauges and two pump starting pressure switches, the pressure switch test circuit, the expansion tank (if the pilot pump is present) are pre-assembled.