18L Eurocylinders Twinset

18L Eurocylinder Twinset

Sale price£1,166.00

O2 clean steel Eurocylinder 18L 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.


Special order

Contact Form & Details

How can we help?

If you need to contact us for any issue or assistance, you can do so online by filling out the online Contact Form, emailing us at sales@dirdirect.com or calling us on +44(0)1305 824 555. If it's about a purchase you've made for us please also include your order number.

Our brick-and-mortar store Underwater Explorers based on Portland, Dorset is staffed 7 days a week, including weekends and bank holidays. As it's an active store visited by divers from around the country and world regularly, if we can't make it to the phone for any reason please leave a message and we'll get back to you asap.

Any queries are usually answered the very same day and at most within 24 hours.


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 start of the 16-mile-long Chesil Beach.  

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

Check out how many wrecks we have around here by clicking on Scimitar Diving's Wreck & Dive Sites chart!

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


O2 clean 18L Eurocylinder Twinset with high-quality BtS stainless steel twinning bands and reliable manifold with an isolator.

These 232bar steel 18L twinsets come 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 come with O2 clean VIP stickers and decals. All sets are tested to working pressure and depressurised prior to shipping by courier.

Please note that due to the weight, the twinset is not delivered assembled. The cylinders will be delivered with valves attached but the twinning bands and manifold isolator bar are separated to minimise damage in transit.

This is a Special Order listing and item advertised will be ordered in once an order is received.


18L Eurocylinder Twinset specification

  • O2 clean
  • Working Pressure: 232 bar
  • Cylinder diameter: 240mm
  • Cylinder length without valve: 71cm
  • Average cylinder weight without valve: 21kg
  • Barrel type BtS Manifold (M25)
  • Marine grade stainless steel BtS Bands

Ordering from outside of the UK mainland?

18L 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: S16116690