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The 273500A final stage hookah filter has been designed to provide quality breathing air to AS2299. Made from high strength gun metal and marine grade brass the filter body is chrome plated and has a working pressure of 250 PSI.

Of most benefit to divers is the fact that the filter has re-packable filter cartridges which are easily replaced in the field. The filter cartridge contains a triple layer of filter chemicals (molecular sieve, activated carbon and molecular sieve) to remove moisture, oil vapor and odors from the air.


The filter assembly has one inlet from the air supply system (3/8 BSPTF), a drain assembly and is provided with two 1/4 BSPT female outlet ports.

The filter is easily fitted to most systems but must be fitted after a decent receiver (water trap) assembly.

Airdive can supply various adaptors and outlet couplings such as Tema® or CEJN® female bodies.

The filter is suppled with mounting hardware, drain assembly and 273700C filter cartridge.

Provision has been made for a gauge to fitted to the top of the filter housing if required with a 1/4 BSPT female port fitted (blank plug standard). An oil filled low pressure gauge with stainless steel case (part number 273219) can be supplied as an option if required.Type your paragraph here.

Mounting requires 2 X 8mm holes spaced 40MM apart to be drilled at the desired mounting position. Stainless steel bolts are provided with the filter assembly for ease of mounting.

Replacing a filter cartridge takes only a few minutes. The main filter body is unscrewed from the base assembly, the old cartridge is unscrewed and a new cartridge is then screwed in. The filter body is then replaced. If the original filter cartridge is to be repacked the allow around 10 minutes for the cartridge change.

Replacement times vary with moisture content in the atmosphere but a minimum of 25 hours per cartridge with two divers can be expected.

It is recommended that a pre filter/particulate filter be installed in line before the 273500A final filter to assist particle and moisture removal such as the Norgren manual or auto drain filters (NF73G3GNQD3 or NF73G3GNAD3).


273700C Spare Filter Cartridge

210136N70 (BS136) O Seal - Filter body end seals

210112N70 (BS112) O Seal - Filter cartridge to filter base seal

273706 42mm filter pad

273704 Polyethylene sintered disc

290101 Molecular sieve, 1 litre container (700 grams))

290301 Activated carbon, 1 litre container (500 grams)



Airdive has recently become a supplier of quality Norgren® filter assemblies and filter consumables. We are aware that many operators currently use Norgren filters and there are those who cannot use Airdive's 273500A series filter due to size or mounting restrictions.

Airdive carries a restricted range of filter assemblies suitable for surface supply diving applications.

We can supply in-line condensate filters and up to 3 person breathing air filter assemblies which have a micronic filter, a coalescing filter and an activated carbon filter.

Consumables include spare micronic filters, coalescing filters, activated carbon filters, complete filter kits and spare seals. Contact Airdive for details and applications.

Air Quality is to AS 2299.

Overseas customers please visit to find dealer locations in your region. Please note! Airdive does not supply Norgren items to overseas customers. We supply customers in Australia only.

Australian customers who have an inquiry regarding spare parts, if possible, please specify approximate age of filter assembly and/or part number if available, off filter element required.




Part Number NFFB64308 Optional Mounting Bracket Part Number N74504-50

Norgren 3 part filter assembly comprising micronic filter, coalescing filter and activated carbon filter for two diver operations. The filter has 3/8 BSPP female inlet and outlet ports, auto condensate drain (with manual over-ride) with condensate site tube. An optional mounting bracket set is available - part number N74504-50.

Spare Part numbers:

  • N5568-01 Ultra air carbon pack element.

  • N5350-98 Coalescing filter.

  • N3698-02 Pre filter / micronic filter.

  • NF50120A-95 F64B/L maintenance kit with seals, micronic filter, carbon pack, coalescing filter and auto drain - the most economical form of maintenance.

  • N74504-50 Optional mounting bracket (powder coated mild steel) for filter assembly.


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Part Number NF73G3GNAD3 Micronic Filter

Norgren F73G general purpose and oil removal micronic filter(40 Um), metal bowl with auto drain and indicator, 3/8 BSPP female inlet and outlet ports.

Part Number NF73G3GNQD3 Micronic Filter

Norgren 73G general purpose and oil removal micronic filter,(40 Um), metal bowl with manual 1/4 turn drain with indicator, 3/8 BSPPF inlet and outlet ports.

Part Number NF73G3GNQP3

Norgren F73G general purpose and oil removal micronic filter (40 Um), protected carbonate bowl with visual liquid level, manual 1/4 turn drain, 3/8 BSPP female inlet and outlet ports.


Part Number NB73G2GKQD3RMN Filter Regulator

Norgren B73 general purpose and oil removal filter regulator, metal bowl with liquid indicator, 1/4 turn manual drain, 3/8 BSPP female inlet and outlet ports. Inlet Maximum - 250 PSI. Outlet maximum - 150 PSI.

Part Number NB73G2GKQD3RMN Filter Regulator

Norgren B73 general purpose and oil removal filter regulator, metal bowl with liquid indicator, 1/4 turn manual drain, 1/4 BSPP female inlet and outlet ports. Inlet maximum - 250 PSI, Outlet Maximum - 150 PSI.





  • NF50100A Mainenance kit for F50 series filter comprising micronic filter, carbon element, coalescing element, and seals.

  • N299211 Micromic element, 25 Um.

  • N433801 pre -filter element, 40 Um.

  • N433802 Micronic filter element for F64G nnn MD3.

  • N433804 Micronic element, 5 Um for FFV68-408.

  • N4380201 Service kit for F64 B/L, F64G, F64L

  • N4380200 Service kit for F64G-NNN-MD3.

  • N5350-98 Coalescing element for FFB64308 filter.

  • N535099 Coalescing element.

  • N535108 element for FFV68408 filter.

  • N5568-01 Carbon element for FFB64308 filter.

Norgren is a registered trade mark of Norgren Limited

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