Morrison|749BSP
MORRISON VENT Pressure Vacuum DN50 (2") BSP F · 749BSP
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Email sales@goind.com.au or call 07 3204 2240 for live availability.
Ships from Brisbane warehouse. Standard delivery 2-5 business days Australia-wide.
BASIC TANK VENTING WITHOUT THE PREMIUM PRICE
Morrison Brothers FIG 749 series pressure vacuum vent for underground and low-volume aboveground fuel storage tanks. DN50 (2") BSP female thread, aluminium body with brass vacuum poppet, Buna-N pipe seal and 40-mesh stainless steel debris and insect screen. Allows the tank to breathe during filling and discharging while the spring-loaded poppets seal vapours when pressure equalises.
What it does
The Morrison VENT is a pressure vacuum relief valve. When you fill the tank, air needs to escape or the back-pressure slows the pump. When you draw fuel out, air needs to enter or the tank collapses. This valve opens in both directions to balance the pressure. DN50 (2 inch) BSP female thread fits most Australian fuel tanks.
Value tier positioning
This is the basic mechanical version. No flame arrestor, no pressure gauge tappings, no stainless internals. It does the core venting job reliably at a fair price. If you need certified flame protection or high-flow venting for fast fills, look at premium options. For standard site tanks where the job is to stop collapse and overpressure, this unit covers it.
Features & Benefits
Key Features
- DN50 (2") BSP female thread for direct fit on AU tank vent risers
- Spring-loaded pressure and vacuum poppets seal vapours when pressure equalises
- 8 oz/sq.in. pressure relief setting (standard 749 series)
- 40-mesh stainless steel screen blocks debris and insects
- Integrated internal drain prevents water pooling on the poppet seat
- Aluminium body with brass vacuum poppet and Buna-N pipe seal
Benefits
- Cuts product loss to evaporation by holding vapours until relief threshold
- Protects tank shell from collapse on thermal vacuum cycles
- Stainless screen meets AS1940 vent debris-protection requirements
- Field-proven 749 series — the AU market standard pressure vacuum vent for over 40 years
| Pressure relief | 8 oz/sq.in. (~14 mbar) |
| Vacuum relief | Per Morrison 749 spec |
| Vent capacity | 8,500 SCFH at 2.5 PSI |
| Size | DN50 (2") |
| Thread type | BSP female |
| Body | Aluminium |
| Pressure poppet | Aluminium |
| Vacuum poppet | Brass |
| Pipe seal | Buna-N |
| Screen | 40-mesh stainless steel |
| Weight | 0.45 kg |
Shipping & Dimensions
Ships from Brisbane warehouse. Standard delivery 2-5 business days.
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8 oz/sq.in. (~14 mbar)
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Per Morrison 749 spec
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8,500 SCFH at 2.5 PSI
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DN50 (2")
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BSP female
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Aluminium
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Aluminium
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Brass
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Buna-N
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40-mesh stainless steel
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0.45 kg
~1.0 kg
Compatible Products
Frequently Asked Questions
Can't find your answer?
Contact UsWhat is the Morrison VENT?
A mechanical pressure vacuum relief valve for fuel tanks. DN50 (2 inch) BSP female thread. Balances tank pressure during fills and dispenses to prevent collapse or overpressure.
What size tank does this suit?
DN50 size typically suits tanks from 1000 to 5000 litres. Check your tank specifications or contact us if uncertain about sizing.
Does it need power or maintenance?
No electrical supply required. Mechanical valve operation. Inspect periodically for debris or corrosion that could affect sealing.
What thread type is it?
2 inch BSP female parallel thread. Standard for Australian fuel tanks. Confirm your tank has matching male thread before ordering.
What warranty and support applies?
12-month warranty on manufacturing defects. Internal valve parts are wear items and excluded. For technical advice or bulk orders, contact sales@goind.com.au or 07 3204 2240.