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800.355.1991 32 Dixon Bayco 2013
Products Petroleum
Petroleum Products
Above Ground Tank
Automatic Pressure/Vacuum Relief Caps for Stationary Tanks
Application: These caps are threaded into the top of stationary (non-mobile) above ground fuel storage tanks,
where they serve two purposes: a) they can be used as a thread in and lockable fuel filler cap.
b) They protect the tank from expansion or implosion, the internal relief valve is normally closed,
but opens to relieve internal pressure or vacuum.
Standards: Manufactured to thread into both NPS and NPT tank openings
Materials: Die cast zinc body, brass screen
Features & Benefits: • Normally closed vent stops fuel evaporation and airborne contaminants
• Protects tank from pressure or vacuum build-up. Relieves pressure at 2 PSI and vacuum at 0.7
HG at a rate of 20 SCFM
• Can be used as a fuel filler cap
• Pad lockable to prevent fuel theft and tampering
Male NPT Part #
2" 2000L
2½" 2500L
Note: Not intended for use on mobile tanks. To ensure that the cap can properly vent, the vent
cap must be kept free of any debris i.e. dirt, snow, ice, rags etc.
2500L
2500SFV
200-PV-9
Standard Vent Caps for Stationary Tanks
Automatic Pressure/Vacuum Relief Caps for Mobile Tanks
Note: To ensure that the cap can properly vent, the vent cap must be kept free of any debris i.e.
dirt, snow, ice, rags etc.
Male NPS Part #
2" 200-PV-9
• Normally closed vent, stops fuel evaporation and airborne contaminants
• Protects tank from pressure or vacuum build-up. Relieves pressure at 7.5-9 PSI and
Vacuum at .33 HG
• Can be used as a fuel filler cap
• Pad lockable to prevent fuel theft and tampering
Male NPS Part #
2½" 2500SFV
Note: Not intended for use on mobile tanks. To ensure that the cap can properly vent, the vent
cap must be kept free of any debris i.e. dirt, snow, ice, rags etc.
• Always open vent
• Protects tank from pressure or vacuum build-up
• Can be used as a fuel filler cap
Product instruction sheets and technical data can be viewed on our website at
dixonbayco.com by selecting the "Resources" menu