8.5L Eurocylinders Twinset

8.5L Eurocylinder Twinset

Sale price£735.00 Regular price£851.00
Save £116.00

Fully assembled O2 clean Eurocylinder 8.5L Twinset with high-quality BtS manifold and marine grade stainless steel twinning bands. If you collect in-store, you get a FREE air or 32% Nitrox fill.

Collection or Delivery?

Collection or Delivery?


Dispatched in 1 to 2 days

Contact Form & Details

Why Portland? 

We’re located on the Isle of Portland (in Dorset) because Portland has been one of the most popular scuba diving locations in the United Kingdom even before we set up operations here back in the year 2000.

On one side, we’re minutes away from the sheltered waters of Portland Marina and Harbour, while on the other, it’s just a brief walk to reach our famous scuba diving destination, Chesil Cove and Chesil Beach.  

Portland’s location makes it ideal for scuba diving, freediving, snorkelling and other water sports activities.

Alongside dive clubs, many instructors and dive schools travel here to train and offer scuba diving certification ranging from open water diver to mixed-gas tech diving or rebreather diving levels.

Whether you’re doing a boat dive from Portland Marina or Castletown or a shore dive at Chesil Cove, Portland is well known for offering many possibilities: Reef diving to wreck diving and night diving, underwater photography or underwater videography. Anything other than cave diving is possible here.

Likely being the best-stocked diving shop in the UK, at Underwater Explorers we offer in-store scuba diving equipment advice and sales, as well as gas fills, to locals and visitors (read About Us).

But... If you’re googling “scuba diving shop near me” like some, look no further, there's DirDirect online.

Here at DirDirect, we list our cutting-edge equipment for worldwide delivery and we’ve got you covered whatever your level of diving: We’re your local dive store wherever you are in the world.

All that with over 20 years of experience especially in technical diving, from training to equipment, advice and sales.


Underwater Explorers, Unit 1, Maritime Business Centre
Mereside, Portland, Dorset, DT5 1FD


Fully assembled O2 clean 8.5L Eurocylinder Twinset with high-quality BtS stainless steel twinning bands and reliable manifold with an isolator.

These 232bar steel 8.5L twinsets are put together with strong 2-inch wide marine grade stainless steel BtS Twinning Bands with Delrin Thumbwheels. The reliable barrel-type BtS Manifold compliments the sets.

All our twinsets are shipped in the UK fully assembled and come with O2 clean VIP stickers and decals. All sets are tested to working pressure and depressurised prior to shipping by courier allowing you to adjust the centre manifold before your first fill.

If you collect your 8.5L twinset in-store from Portland, you get a FREE air or 32% Nitrox fill too. UK mainland delivery is available for a small additional charge. For any other destination, please contact us before placing an order.


8.5L Eurocylinder Twinset specification

  • O2 clean
  • Working Pressure: 232 bar
  • Cylinder diameter: 140mm
  • Cylinder length without valve: 72cm
  • Average cylinder weight without valve: 10.7kg
  • Barrel type BtS Manifold (M25)
  • Marine grade stainless steel BtS Bands

Ordering from outside of the UK mainland?

8.5L Eurocylinder Twinset do not qualify for our standard shipping fees due to the shipping costs. If you want these delivered outside the UK mainland, contact us using our ONLINE CONTACT FORM with your delivery address. We are then able to provide you with a non-binding shipping quote.


New to manifolds and twinsets? FAQ: See how it works

When the manifold centre valve is in the “open” position, both cylinders will be equalised, acting as a larger gas supply whether the diver is breathing off the primary or backup regulator.

So long as left and right-hand valves remain open, each regulator will give access to what is now a single gas supply.

When the manifold valve is in the “closed” position, the cylinders will be isolated from each other and run independently. Effectively creating two separate gas supplies accessed by the backup or primary regulator, respectively.

The main advantage of the twinset manifold is that it provides redundancy in case of failure involving either side. Closing the manifold valve will effectively isolate one cylinder (one side) from the other, providing the diver with the remaining gas from the valve on the functioning side.

If the manifold is in an open position, but either the left or right-hand cylinder valve is closed, the regulator attached to that valve (post) will not provide access to the gas in any of the cylinders.

That post's valve will have shut down gas flow to the regulator attached to it, even if the manifold valve itself is open. However, the regulator on the open post will still have access to the total gas supply (both cylinders) unless the manifold is closed.


SKU: S16816681