Replacing any of the diving hoses on your regulator is a simple task that can be done with just a few basic tools and a bit of silicone grease but if you're not sure what hose type or length you need it can seem a bit confusing. You'll find details of standard fittings and lengths below but if you have regulators that are a little more obscure, or you need further information about hoses, please read our diving hose guide.
Hoses come in two basic make-ups, rubber and braided. Rubber hoses are traditional and manufacturers are steadily replacing rubber hoses with braided hoses as their popularity continues to grow. Replacing rubber to braided hoses is a common upgrade route taken by divers with older regulators. Braided hoses are lighter, stronger, have a higher burst pressure (safer) and offer better protection against UV and contamination damage. If you regularly fly to diving destinations you'll find that replacing rubber hoses with braided hoses can make a significant saving of luggage weight.
Regulator typically use a 3/8" fitting to connect the hose to the first stage. There are a few exceptions in older regulators so check out the guide for more details. The standard length is 75cm for primary regulators and 90-100cm for an octopus.
Inflator hoses are only available in a 3/8" fitting and 99% of BCDs and Drysuits will use the standard quick disconnect fitting, the exception being Safe Second stages such as the Scubapro Air II. Check the guide for details about those. The standard length for a BCD inflator hose is 65cm and a drysuit hose is usually 75cm but that will depend on your routing preferences.
Pressure gauges / consoles use a standard 7/16" fitting to connect to the first stage with a typical length of 90cm. If you are buying a high pressure hose to move a wireless air integration transmitter off the first stage (or similar situation) please remember that you'll need a High Pressure Swivel Spool to go between the gauge and hose connections otherwise it will leak.