Scully 01445 Combination Vent Alarm And Fuel Oil Gauge For 42"-44" Deep Tanks Tank Fitting Is 2" Male NPT Vent Alarm Fitting 1-1/2" Female NPT For 42" And 44" Deep Vertical Oil Tanks The Original Combination Whistle Alarm and Level Indicator One-unit fill alarm and level indicator saves installation costs Protects against spills Durable and leak-proof construction Easy-to-read level indicators Easy installation