The Morrison Bros FIG 155 and 155S are T-style double outlet open vents designed primarily for small aboveground storage tanks. The 155 features female NPT threads while the 155S uses a slip-on with set screw connection. Note: open vents allow unrestricted evaporation of product.
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The Morrison Bros FIG 155FA is a T-style double outlet open vent with integrated flash arrester, designed primarily for small aboveground storage tanks. Dual outlet ports maximise airflow, while the cone-shaped flash arrester prevents outside flames from entering the tank. Available in female NPT threaded or slip-on installation styles.
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The Morrison Bros FIG 156 is a 2" NPT aluminum mushroom vent for aboveground storage tanks where an open air down vent configuration is acceptable. A 30 mesh stainless steel screen protects the vent pipe from debris, and the aluminum body provides corrosion resistance for longevity in outdoor environments.
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The Morrison Bros FIG 351S & 748A combines a flame arrester with a pressure vacuum vent to provide a positive barrier against flame transmission into storage tank vapor spaces. Designed for use on atmospheric aboveground storage tanks handling normal hydrocarbon vapors such as gasoline.
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The Morrison Bros FIG 352 is an end-of-line, open air deflagration flame arrester designed to prevent external flames from flashing through the vent line into a storage tank's vapor space. Built for petroleum storage tanks containing Group D fluids, it features 304 stainless steel arrester plates and a water-resistant aluminum cover.
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The Morrison Bros FIG 748ALT is a 2" aluminum pressure vacuum vent designed specifically for aqua-ammonia and ag-chemical storage tanks. Pressure and vacuum poppets seal vapors when pressure is equalized, allowing the tank to breathe safely during filling and dispensing operations.
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The Morrison Bros FIG 749 is a pressure vacuum vent for underground and low volume aboveground storage tank vent pipes. Pressure and vacuum poppets seal vapors when pressure is equalized, allowing the tank to breathe safely during filling and discharging. The 749T variant is designed for DEF and products requiring PTFE and stainless construction.
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The Morrison Bros FIG 749CRB is a pressure vacuum vent for underground and low-volume aboveground storage tank vent pipes. Pressure and vacuum poppets seal vapors when pressure is equalized, allowing the tank to breathe during filling and discharging. CARB-certified models are available, and select models meet EPA 40 CFR Part 63 requirements for Gasoline Dispensing Facilities.
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The Morrison Bros FIG 749CRBS is a slip-on style pressure vacuum vent for underground and low volume aboveground storage tanks used in motor fueling. Poppets seal vapors when pressure is equalized, allowing the tank to breathe safely during filling and discharging operations.
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The Morrison Bros FIG 749S is a slip-on style pressure vacuum vent for underground and low-volume aboveground storage tank vent pipes. Pressure and vacuum poppets seal vapors when pressure is equalized, allowing the tank to breathe during filling and discharging operations. Settings are approximate.
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The Morrison Bros FIG 922 combines a pressure vacuum vent and an audible overfill alarm in a single unit, installing on top of the vent pipe through one 2" or 3" tank opening. The fully mechanical whistle alarm requires no electricity or batteries, activating at a preset liquid level during filling operations.
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The Morrison Bros FIG 748A is a 2" aluminum pressure vacuum vent for aboveground and underground storage tanks, installed on top of the vent pipe. Poppets seal vapors when pressure is equalized and open to allow the tank to breathe during filling and dispensing. Must be used in conjunction with an emergency vent.
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The Morrison Bros FIG 748A is a 3" aluminum pressure vacuum vent designed for installation on top of the vent pipe of an aboveground storage tank. Poppet seals retain vapors when pressure is equalized, allowing the tank to breathe during filling and dispensing while venting outward and upward in compliance with NFPA 30. Must be used in conjunction with an emergency vent.
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The Morrison Bros FIG 748A is a 2" pressure vacuum vent with pressure discharge hood, designed for installation on aboveground or underground storage tank vent pipes. Poppets seal vapors when pressure is equalized, allowing the tank to breathe safely during filling and dispensing operations.
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The Ridart 190 vent cap is used on vapor recovery lines to allow air entry into the tank and help regulate tank atmosphere. An internal screen protects the line from dirt, insects, and other particles that could block the vent. It is not a safety device and should be combined with an appropriate end‑of‑line deflagration flame arrester when used with flammable liquids.
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The Ridart 197 is a pressure vacuum valve designed for Stage I vapor recovery systems on underground storage tanks. It regulates tank pressure to protect against overpressure while reducing fuel evaporation and environmental pollution. Constructed from aluminium with Viton® seals and brass poppets, it complies with ATEX Directive 2014/34/EU.
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