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781 | Breather / Drain Plug Available in brass, nickel plated brass, aluminium, stainless steel & nylon

Breather / Drain Plug, Globally Approved, Explosive Atmosphere Cable / Conduit Accessory

• 781E for Ex e use
• 781D for Ex d use
• Drains equipment susceptible to moisture collection
• Enables equipment to breathe
• General purpose / industrial version available
• Nylon Ex e only version available (-20˚C to +60˚C)
• -60˚C to 130˚C (metallic versions)
• Globally marked, IECEx, ATEX & cCSAus



e.g. 781 – D – M – 3 = Ex d – M25 e.g. 781 – E – M – 3 = Ex e – M25 Other Thread Variations are available on request. For further information on ordering please refer to page 150. The CMP 781E range of Increased Safety type ‘e’ breather / drain plugs have been tested together with CMP serrated washers to ensure that in areas that are subject to vibration the plug does not suffer from self-loosening and in advertently fall out of the enclosure. Serrated washers are not included as standard but can be ordered separately

BS 6121:Part 1:1989, IEC 62444, EN 62444
IK10 to IEC 62262 (20 joules) Brass & Stainless Steel Only
SIRA 10 ATEX 1307U
781D: II 2G Ex d IIC Gb, II 1D Ex ta IIIC Da
781E: II 2G Ex e IIC Gb, II 1D Ex ta IIIC Da
EN 60079-0,1,7,31
IECEx CML 18.0187U
781D: Ex d IIC Gb, Ex ta IIIC Da
781E: Ex e IIC Gb, Ex ta IIIC Da
IEC 60079-0,1,7,31
781D: Ex d IIC, Class I, Zone 1 AEx d IIC; Class I Div 1, Groups A,B,C,D
IP66, Enclosure Type 4X
781E: Ex e II, Class I, Zone 1, AEx e II
IP66, Enclosure Type 4X
CSA C22.2 No 0-10, 0.5, 30, 94; e 60079-0,1,7, E61241-1-1, UL50, 1203, UL60079-0,1,7
781D: Class I, Zone 1 AEx d IIB; Zone 20 AEx ta IIIC
781E: Class I, Zone 1, AEx e IIC;
TC RU C-GB.AA87.B.00487
TÜV 12.133OU
GYJ13.1139X (781D), GYJ13.1138X (781E)
LRS: 01/00173
781D: -60°C to +130°C
781E: -60°C to +130°C (-20°C to +60°C Nylon)
781D: IP66 (when fitted with CMP sealing accessories)
781E: IP66
Brass, Nickel Plated Brass, Aluminium, Stainless Steel, Nylon (781E only)
Integral Entry Thread equipment interface ‘O’ ring seal, Castellated Locknut

The 781D can be used with enclosures up to 30 litres for group IIB gases and enclosures up to 2.5 litres for group IIC gases
** When CMP installation accessories are used (781E). Refer to Maintaining a Seal for further information.


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781DM2781EM2M20 x 1.50.590.501.181.307
781DM3781EM3M25 x 1.50.590.501.421.5610
781DT1781ET1½ NPT0.780.501.181.307
781DT2781ET2¾ NPT0.800.501.421.5610
781DM2781EM2M20 x 1.515.012.730.033.07
781DM3781EM3M25 x 1.515.012.736.039.610
781DT1781ET1½ NPT19.912.730.033.07
781DT2781ET2¾ NPT20.212.736.039.610