28XR 1st Stage

Product No: 416411


The technological features of the 28XR 1st stage make it the very best among technical diving products. The 28XR 1st stage has exclusive features, such as a vertical port and 4 lateral ones that mean it is perfectly suited to stage, double tank and sidemount configurations.

Product Information


Mares fitted the 28XR first stage with the very best in modern regulator technology. It uses the innovative balanced diaphragm concept, which is operated by a double piston, all ecologically sealed using AST - Auto Sealing Technology. This also guarantees a perfect seal against the possible entry of sand or particles, especially in cave diving or in polluted waters, also giving the diver the possibility of removing it in the water without flooding it. The rotating turret with vertical low pressure outlet and 4 more low pressure outlets make it usable in all configurations. Its flexibility allows it to be used on a double tank, in stages and in sidemount configurations.

• Regulators for sidemount
• Regulators for rear configuration
• Regulators for stage

The main features of the 28XR are:
• Polished chrome metal body
• Natural DFC on all LP outlets
• Balanced membrane and watertight TBP system (Twin Balanced Piston)
• Watertight anti-infiltration technology (Auto Sealing Technology, AST)
• 4 LP ports on a revolving turret
• 1 vertical LP port
• 2 symmetrical HP ports at an angle of 10° for perfect positioning of the hose
• DIN only - 300 bar
• Weight: <790 g


First stage weight DIN:
760 g / 27 oz
First stage weight NX:
763 g / 26.9 oz
High pressure ports:
2 [7/16" UNF]
Low pressure ports:
4 Radial 3/8” UNF Ports - 1 Vertical 3/8” UNF Port

Delivery & Returns


Online purchases on mares.com are enabled for Italy, France, Spain, Germany, Austria, Netherlands, Luxemburg, Belgium and Finland. Some products from the catalogue are only available to purchase at an authorised Mares Dealer.

Products shipped in Italy are entrusted to Bartolini couriers. Products shipped in other countries are entrusted to DHL couriers.

Delivery times are 3-5 working days.



If you are not satisfied with your order, you can return it quickly and easily.

You can decide to return any products purchased on mares.com within 30 days of delivery. To return items, use the same box they were received in, complete the returns label found here with shipping details and attach it to the box. Remember to insert the delivery number found on page 1 of the delivery documents.


To allow you greater freedom, we have not chosen a courier service with which you need to return the package, you are free to choose your preferred service provider.

Please remember that shipping costs are your responsibility.


You will receive the total refund on the same payment method you used to place your order, within 14 days after your return has reached our warehouse. 


At the moment, we cannot offer exchanges on our products. If you would like a different size, please return the article for a refund and purchase a new size. If you still have any doubts, you can write us an email at shop@mares.com, our Customer Service team will be happy to help.