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Pressure Vent Fill Cap and Fuel Fill Vent Cap are for above ground tanks. The Fill Cap Top Seal and Fill Cap Side Seal are for below ground tanks.
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50 Pressure Vent Fill Cap is for pickup trucks and other above ground fuel storage tanks. Helps keep most water out of the tank and cut down on evaporation. Less evaporation loss can save up to 17 gallons for every 300 gallons you use. $22.56


179MCI Cast Iron Fuel Vent Cap has a loose hinged cover for the vent. For a 2" NPT opening on above ground storage tanks. The 179MCI is also a good Fuel Oil Tank Fill Cap. $14.04


305C Top Seal Fill Cap is meant to be used with a Top Seal Fill Adaptor. $34.81


305L-4X4 Top Seal Fill Adaptor is 4" designed to mate with the 305C Top Seal Fill Cap for above or below ground tanks. $40.24


405 Side Seal Fill Adaptor is 4" designed to mate with the 405C Side Seal Fill Cap for above or below ground tanks. $45.58


405C Side Seal Fill Cap is meant to be used with a Side Seal Fill Adaptor. $39.78


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