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(Clear of water 1 hour before end of session)

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Activities are open most weekends, bank holidays, selected dates during School Holidays & occasional mid week dates.

Please see our full opening times ›

Activities & Events

Site Facilities

Diving Information

Centre Information

National Diving & Activity Centre
Tidenham
Chepstow
Gloucestershire
NP16 7LQ

Tel:

email

Please be advised that the NDAC office is closed Monday to Thursday, so emails and phone calls may not be responded to during this time. Depending on when you make your enquiry it may take a few days before we can get back in touch with you.

The NDAC Gas Room

the gas room facility>
gas prices>

The Gas Facility

Our top of the range gas room offers one of the UK’s finest facilities.

Our gas room contains some of the most advanced gas mixing equipment available on the market today and has the capacity to provide for all your needs and more.

The gas room is situated next door to the Dive Shop making it convenient to have your cylinders filled and pay for your gas.

A range of gasses are available including nitrox, oxygen and trimix.

11k If we are not too busy we will pump all gasses while you wait, and if we are busy, we have over 100,000 litres of double filtered air stored in banks, which means less queuing for you, the customer.

Our gas and air prices are very competitive and we always strive at the centre to offer you a competitive and accurate range of mixes by our fully trained and qualified staff.

We have also had a state of the art helium analyser so you no longer have to dump the valuable helium based gas in your cylinders in order to allow someone else to "partial pressure cascade". We don't have to mathematically work out your helium and oxygen mixes. We have two oxygen analysers on-line at any one time, and trimix and heliair are physically analysed to +/- 1% accuracy.

The centre has also invested in 2 Hamworthy Premiair Compressor with twelve air charging outlets, and a separate three outlet Nitrox/Trimix panel, again making gas fills even quicker if that’s possible.

cylinders 9k Cylinders have test dates and are subject to regulations, if your cylinder is out of date or in poor condition we will refuse to fill it. If you need a service on your cylinder why not take it to our technicians. For details of the cylinder servicing and the other services offered by our technicians please visit our servicing page. more>

If you do not currently own a cylinder you can hire one from us (along with pretty much everything you would need to carry out a dive!). more>

Air & Nitrox costs - Members From 23 July 2019. Membership Details >
Mix	Suit Inflation	upto 3 Ltrs	upto 7 Ltrs	upto 10 Ltrs	upto 12 Ltrs	upto 15 Ltrs	upto 18 Ltrs	upto 20 Ltrs	upto 24 Ltrs
Air	£1.00	£2.60	£3.20	£3.80	£4.00	£4.40	£4.90	£6.00	£6.40
Air 300 Bar	N/A	£4.00	£4.30	£4.50	£5.00	£6.00	N/A	£7.00	£8.10
EANX 28%	N/A	£2.75	£3.80	£4.80	£6.00	£7.20	£8.10	£9.00	£11.00
EANX 30%	N/A	£2.90	£4.15	£5.00	£6.50	£7.60	£8.60	£9.50	£11.30
EANX 32%	N/A	£3.10	£4.90	£6.00	£7.10	£9.00	£10.00	£11.80	£13.95
EANX 36%	N/A	£3.45	£6.00	£7.95	£8.90	£10.10	£11.60	£13.50	£14.95
EANX 40%	N/A	£3.55	£6.55	£8.10	£9.50	£11.90	£14.95	£16.00	£17.50
EANX 50%	N/A	£4.85	£8.10	£10.60	£13.50
EANX 60%	N/A	£4.95	£9.95	£12.50	£14.50
EANX 70%	N/A	£5.50	£11.20	£15.05	£17.00
EANX 80%	N/A	£7.00	£12.95	£17.50	£19.00
Oxygen	Oxygen will be charged at 1.9 pence per lt plus a £1.80 fill charge.					NDAC Diver Membership >
Trimix & Heliair	Trimix and Heliair charges are 3.4 pence per ltr of helium used + 1.9 pence per ltr of O2 and standard £3.30 fill charge.					NDAC Diver Membership >

Air & Nitrox costs - Non Members From 23 July 2019
Mix	Suit Inflation	upto 3 Ltrs	upto 7 Ltrs	upto 10 Ltrs	upto 12 Ltrs	upto 15 Ltrs	upto 18 Ltrs	upto 20 Ltrs	upto 24 Ltrs
Air	£1.20	£3.00	£3.90	£4.10	£4.50	£5.00	£5.30	£6.40	£7.40
Air 300 Bar	N/A	£4.50	£5.00	£5.40	£5.70	£6.90	N/A	£7.60	£8.50
EANX 28%	N/A	£3.50	£4.50	£5.90	£7.40	£8.00	£9.10	£10.20	£12.00
EANX 30%	N/A	£3.60	£4.65	£6.10	£7.55	£8.40	£9.20	£10.50	£12.50
EANX 32%	N/A	£4.00	£5.40	£7.00	£8.40	£10.00	£10.80	£12.70	£16.00
EANX 36%	N/A	£4.20	£6.90	£8.95	£9.50	£11.00	£12.20	£14.00	£17.50
EANX 40%	N/A	£4.80	£7.40	£9.40	£10.40	£12.80	£15.95	£17.00	£18.50
EANX 50%	N/A	£5.00	£9.40	£11.60	£14.50
EANX 60%	N/A	£5.30	£11.00	£13.50	£15.50
EANX 70%	N/A	£5.90	£12.50	£16.20	£18.00
EANX 80%	N/A	£8.00	£14.00	£18.70	£21.00
Oxygen	Oxygen will be charged at 2.1 pence per lt plus a £2.00 fill charge.
Trimix & Heliair	Trimix and Heliair charges are 4.0 pence per ltr of helium used + 2.1 pence per ltr of O2 and standard £3.80 fill charge.
You must show the centre staff your certificate to get any gas other than air. No Certificate - No Gas If you are on a training course your instuctor will be required to sign for your gas Fill times can vary so please be patient. The staff will not rush the process, so please don’t ask All gas prices are subject to change without notice. The centre staff have the right to refuse to fill at their discretion and their decision is final.
All cylinders MUST be in test and correctly labeled for the gas requested.

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National Diving & Activity Centre, Tidenham, Chepstow, Gloucestershire, NP16 7LQ. Tel: Email | Website by Studio JERO | Hosted on Pipe10 Servers

The NDAC Gas Room

The Gas Facility

Air & Nitrox costs - Members From 23 July 2019. Membership Details >

Air & Nitrox costs - Non Members From 23 July 2019

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