Collection: Cylinders & Valves

Choosing Your Cylinder: Material, Shape & Setup Choose your cylinder around the gas you need, your diving configuration and how it affects your weighting and trim.

1. Steel vs Aluminium Steel is a practical choice for local backmount diving and can reduce the lead you need to carry. Aluminium is popular for stage, bailout and sidemount cylinders, but its buoyancy changes as gas is used. Check the particular cylinder’s buoyancy and plan your weighting for both the start and end of the dive.

2. Flat vs Round Bottom Flat-bottom cylinders can stand upright without a boot; round-bottom steel cylinders need a suitable cylinder boot to do so. Secure either type during storage and transport. Choose by dimensions and rig compatibility as well as capacity.

3. Match Your Valve Cylinder neck threads, working pressure and regulator connections must be compatible. Our bare cylinders use M25 × 2 neck threads. Choose a right-hand mono valve for a suitable single-cylinder setup, left/right modular valves for your sidemount configuration, or a correctly spaced isolating manifold for a twinset. We can help confirm the parts before you order.

4. Bare or Set Up by Oceanauts Single cylinders are supplied bare, with valves sold separately. Our optional setup service costs £35 per single cylinder or £85 for the twinset, including initial inspection, valve/manifold installation, contents stickers, leak checks and an initial air fill. Twinset setup also includes band assembly and alignment. Assembled and filled cylinders are collection only; oxygen cleaning and Nitrox fills are separate services.

Oceanauts Standard Choose equipment that suits your diving rather than simply the largest cylinder. When our UK supplier has stock, the Nautilus-supplied range usually reaches Oceanauts within 1–2 working days. We will confirm availability and arrange dispatch or collection; setup and filling take place before collection.