50 gallon atl petro-flex pillow-style marine range extension fuel bladder atl marine fuel bladders this brand new 50 gallon atl petro-flex includes: (1) 105410 atl 50 gallon petro-flex range-extension fuel bladder with 2" diameter fill/stand pipe, 1/2" fnpt brass ball valve outlet with hose barb fitting and safety lock and protective underliner mat.