Switch Block with Built in Bail Indicator

Price on Application

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Please note: Patent pending for Europe and USA


Body & Connectors: Brass CZ121

Rack & Pinion: Acetal

Circlip: Stainless Steel 316L
Spring & ball bearing: Stainless Steel 316L
O Rings: NBR Nitrile
Finish: Bright Chrome Plate

Weight: 230g


Main via 1st Stage Reg: >150m3/hr @ 10bar outlet / 50 bar inlet.
Bail via 1st Stage Reg: >150m3/hr @ 10bar outlet / 50 bar inlet.


  • Ergonomically designed solution to a single point breathing system. The switch block was developed to allow the diver to switch from main cylinder to reserve with a one-handed, easy action.
  • The slide valve is in the down position for the main gas feed and pushed up to bring reserve or bail out cylinder in line. When on reserve, the top part of the slide shows red to indicate to the support diver that his partner is on reserve gas. The action of the slide valve is checked in the up and down position by a spring pin index.
  • Non-Return Switch BlockNon-return valve: The non-return valve is located in the main inlet connection to prevent back flow from the bail inlet into main inlet when switched open.
  • Flow:
  • Main via 1st stage reg - >150m3/hr @ 10 bar outlet / 50 bar inlet
  • Bail via 1st stage reg - >150m3/hr @ 10 bar outlet / 50 bar inlet

Delivery, Returns & Instore Collection

When will I receive my order?

International Delivery Times

Monday – Friday 3 – 5 Working Days

UK Mainland Delivery Times

Monday – Friday before 2pm Next Working Day
Monday – Friday after 2pm 2 Working Days
Saturday & Sunday 2 Working Days

UK Extended Areas Delivery Times

Monday – Sunday 3 – 5 Working Days

Please note delivery times may be extended during busy periods.

EU Areas

Please note that due to changes by HMRC, orders being shipped to EU countries will not be shipped on the same day as they are invoiced. EU Orders will now be shipped on the next working day. This only applies to E.U. orders. Domestic and Worldwide shipments remain the same.

Collect In Store?

When you go to the online checkout, you can opt to collect your items in store. We'll let you know when your order is ready for you to collect. Your order will normally be ready to collect the next working day.

Returns, refunds or exchanges?

You can return any item within 28 days of receipt for a refund, provided the item is unused, in its original packaging and in 'as new' condition.

Items will be refunded in full (less postage) if received within 28 days from the date of despatch.


We aim to deal with all returns and exchanges on the day they arrive, however please allow longer during peak periods.

You can return the item(s) by dropping them off in store or by returning the item(s) by post. We do not insist on a specific courier service for the return, so please use the most economical or appropriate method for returning the item(s).

Northern Diver (Int) Ltd
Appley Lane North
Appley Bridge

If an item becomes faulty after a period of time then please contact customer services (01257 254 444 or info@ndiver.com) prior to returning the item. We will either repair or replace the item at our discretion.

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Trade Customers

Northern Diver offers trade accounts to commercial organisations and to those who work in or around water. Please click here to register your details and find out if you qualify. Once your trade account has been confirmed you can view all trade prices and shop easily online when logged into your account. Please note when you are not logged in to your trade account retail prices are shown. If you have any queries please do not hesitate to contact us. Tel: +44 (0) 1257 25 44 44.