Type 311 Power Supply Unit£140.00 The Type 311 power supply is designed to run two Type 305 SSVI units simultaneously. Type 311 Power Supply Unit quantity Add to basket Category: SSVI Apparatus Description Description Mains input (240V standard please ask for 110V option). Output sockets to take Type 305 SSVI water resistant plugs. Related products SSVI ApparatusType 305 SSVI £732.00 Add to basket SSVI ApparatusType 306 SSVI £1,750.00 Add to basket