{"product_id":"pressure-vacuum-vent-50mm-8oz-ast-f-pvav2-for-use-on-petrol-tanks","title":"MORRISON VENT Pressure Vacuum DN50 (2\") BSP F · 749BSP","description":"\u003cp\u003eThe Morrison Brothers \u003cstrong\u003eFIG 749 series pressure vacuum vent\u003c\/strong\u003e sits on top of underground and low-volume aboveground fuel storage tank vent pipes. The vent allows the tank to breathe during filling and discharging operations and the spring-loaded pressure and vacuum poppets seal vapours when pressure equalises — protecting product loss to evaporation and preventing tank deformation under thermal cycling.\u003c\/p\u003e\u003cp\u003eThis is the \u003cstrong\u003eDN50 (2\") BSP female\u003c\/strong\u003e variant in aluminium, set to \u003cstrong\u003e8 oz\/sq.in.\u003c\/strong\u003e pressure relief, the standard 749 series specification used across petrol, diesel, kerosene and aviation fuel storage in Australia.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCompatible fluids:\u003c\/strong\u003e Petrol · Diesel · Aviation Fuel · Kerosene\u003c\/p\u003e\n\u003ch3\u003eKey features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eDN50 (2\") BSP female thread for direct fit on AU tank vent risers\u003c\/li\u003e\n\u003cli\u003eSpring-loaded pressure and vacuum poppets seal vapours when pressure equalises\u003c\/li\u003e\n\u003cli\u003e8 oz\/sq.in. pressure relief setting (standard 749 series)\u003c\/li\u003e\n\u003cli\u003e40-mesh stainless steel screen blocks debris and insects\u003c\/li\u003e\n\u003cli\u003eIntegrated internal drain prevents water pooling on the poppet seat\u003c\/li\u003e\n\u003cli\u003eAluminium body with brass vacuum poppet and Buna-N pipe seal\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhy it matters\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eCuts product loss to evaporation by holding vapours until relief threshold\u003c\/li\u003e\n\u003cli\u003eProtects tank shell from collapse on thermal vacuum cycles\u003c\/li\u003e\n\u003cli\u003eStainless screen meets AS1940 vent debris-protection requirements\u003c\/li\u003e\n\u003cli\u003eField-proven 749 series — the AU market standard pressure vacuum vent for over 40 years\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhere it's used\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eUnderground petrol and diesel storage tanks (UST)\u003c\/li\u003e\n\u003cli\u003eLow-volume aboveground fuel storage tanks (AST)\u003c\/li\u003e\n\u003cli\u003eAviation fuel storage at airfields and depots\u003c\/li\u003e\n\u003cli\u003eKerosene and lighting fuel bulk storage\u003c\/li\u003e\n\u003cli\u003eService station forecourt tank venting\u003c\/li\u003e\n\u003cli\u003eFarm and mine site refuelling installations\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical specifications\u003c\/h3\u003e\u003ctable class=\"product-specs\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003ePressure relief\u003c\/th\u003e\n\u003ctd\u003e8 oz\/sq.in. (~14 mbar)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eVacuum relief\u003c\/th\u003e\n\u003ctd\u003ePer Morrison 749 spec\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eVent capacity\u003c\/th\u003e\n\u003ctd\u003e8,500 SCFH at 2.5 PSI\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSize\u003c\/th\u003e\n\u003ctd\u003eDN50 (2\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThread type\u003c\/th\u003e\n\u003ctd\u003eBSP female\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBody\u003c\/th\u003e\n\u003ctd\u003eAluminium\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePressure poppet\u003c\/th\u003e\n\u003ctd\u003eAluminium\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eVacuum poppet\u003c\/th\u003e\n\u003ctd\u003eBrass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePipe seal\u003c\/th\u003e\n\u003ctd\u003eBuna-N\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eScreen\u003c\/th\u003e\n\u003ctd\u003e40-mesh stainless steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd\u003e0.45 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003eFor sizing, alternate threads, or technical enquiries contact GO Fill at \u003ca href=\"mailto:sales@goind.com.au\"\u003esales@goind.com.au\u003c\/a\u003e or call \u003ca href=\"tel:0732042240\"\u003e07 3204 2240\u003c\/a\u003e.\u003c\/p\u003e","brand":"GO Industrial","offers":[{"title":"Default Title","offer_id":53686837084532,"sku":"749BSP","price":390.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0954\/5508\/4916\/files\/morrison-pressure-vacuum-vent-50mm-8oz-6245421.png?v=1764000130","url":"https:\/\/fill.goind.com.au\/products\/pressure-vacuum-vent-50mm-8oz-ast-f-pvav2-for-use-on-petrol-tanks","provider":"GO Fill","version":"1.0","type":"link"}