Treloar Products

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The MC307 Throwover Manway is used on road tankers for dangerous goods where frequent access is necessary or a low profile is desired. This product is ideally suited for aviation applications.
An emergency vent, pressure and vacuum vent and free vent are all contained in the manway under an integral weather cover.
The assembly complies with AS2809.2 requirements for small compartment tanks.


  • Low profile design.
  • Three Locking handles are used for quick release of the cover when access is required. Three handles also means a secure, even locking action.
  • The pressure and vacuum vent is located in the centre of the emergency vent lid. The vents are protected from the ingress of water by a combination of an efficient weather cover and a drainage path.
  • A rollover protection valve shuts off the normal venting in the event of a tanker rollover.
  • Throwover stops on the coaming for the cover and swing bolts prevent contact and wear on the walkway.
  • Large capacity emergency vent suits tankers with exposed area up to 28m².


PV Vent pressure relief = 16 ± 1 kPa
PV Vent vacuum relief = -2 ± 1 kPa
Emergency Vent relief pressure = 30 ± 3 kPa
Emergency Vent Capacity = 6400m³/hr at 45 kPa

Latest news

Sep 29, 2020
Welcome to our new digital home
As you may have noticed, things have changed a little bit around here.  

Sep 28, 2020
Project: Loading Arm for Propylene Glycol (PGI)
This was a loading arm for Propylene Glycol (PGI), the customer needed it in a very short lead-time and we were able to deliver. Typically, this type of arm would take us 8-10 weeks as they are manufactured to order in our workshop, but we were able to deliver in just 6 weeks including painting and ...

Sep 27, 2020
Industry coupling offers LNG innovations
Treloar Trading and its international partner ARTA are offering the global market new LNG products, including gas dry break and breakaway coupling technology as well as cryogenic equipment for loading and unloading. LNG is a global commodity accounting for a significant percentage of worldwide gas ...