5 Scuba Air Compressors [For Filling Tanks & On Boat] 07.11.2020 · Oil pressure switch and gauge; Overload protection for the electric motor model ; Two filling hoses; P41 purifier with refillable purifier element; 2 nd and 3 rd stage water condensate and oil separator An automatic start and stop is an optional feature; however, it should be a standard feature with a scuba compressor. Alkin 31W Mariner. For true portability, …