Exe Breather Drain Documentation Back

Ex e breather drains



  • Manufactured from a range of materials including: Polyamide, Brass, Nickel Plated Brass, Aluminium and Stainless Steel.
  • ISO and NPT sizes
  • Suitable for hazardous areas
  • Certified to Ex II 2GD, Ex IIC, Ex tb IIIC Db, Ex I M2, Ex e I Mb
  • Protection class: IP66 (Dustproof and protection from water jets)
  • Temperature rating -30ºC to +85ºC for polyamide and -30ºC to +100ºC for metal
  • Special lock nut is supplied with the metal breather drains.
  • Dimensions: from M20 x 1.5 to M25 x 1.5 and NPT ½” to ¾” sizes.


SIRA 09 ATEX 3321U (Metal) and SIRA 09 ATEX 3050U (Polyamide)

Ex protection type (EN 50019/IEC 60079-7)

Ex II 2 GD

Ex e IIC Gb


Ex I M2

Ex e I Mb

Ingress protection levels

IP66 (EN 60529/IEC 60529)

Ambient temperature

-30ºC to +85ºC for polyamide and -30ºC to +100ºC for metal


Fluctuations in temperature within an enclosure can lead to condensation. Condensation forms rapidly particularly inside airtight enclosures because humidity cannot escape and this can lead to component damage and in extreme cases short circuits or failure of the unit. It is possible to alleviate this potential problem through the use of breather drains which allow condensation moisture to escape from the base of enclosure.

IP66 Breather drains are available in polyamide, aluminium, nickel plated brass, unfinished brass and stainless steel for Ex e and Ex d enclosures to Ex II 2 GD, Ex e IIC Gb, EX tb IIIC Db, Ex I M2 and Ex e I Mb. Sizes are M20, M25 and NPT ½” and ¾”.


Thread size

Nut size
Brass Nickel plated brass Stainless steel Aluminium Polyamide
77002521 75002521 76002521 74002521 M20 27 15
77002526 75002526 76002526 74002526 M25 31.8 15
73000521 M20 28.6 15
73000526 M25 34.3 15
77002013 75002013 76002013 74002103 NPT ½” 28.6 15
77002035 75002035 76002035 74002035 NPT ¾” 33.0 15
73000013 NPT ½” 28.6 15
73000035 NPT ¾” 34.9 15
Technical data (Extract) (For detailed information please click here)

Protection class

IP 66 (EN 60529/IEC 60529)


see data sheet


Polyamide, Brass, Nickel Plated Brass, Aluminium and Stainless Steel.


see data sheet


Impact resistance – see data sheet


Exe 03 Breather Drain  

Exe_01 breather drain

Declaration of Conformity

Customer requirements

Operating Instructions