Hydraulic Breather Caps

Hydraulic breather caps are parts used to protect equipment against moisture and particle contamination. Moisture vapour is stripped from the air and expelled back into the atmosphere by pump cycles which means moisture is exerted with each flow cycle by the opening and closing of the breather caps. These caps also prevent dirt particles from entering the equipment at very high efficiency rates.

What are hydraulic breather caps used for?

Air trapped within hydraulic systems expands significantly above 72°C. This can cause vibration and unsteady function of machinery. Hydraulic breather caps release the trapped air to bring the system back into balance. Breather caps are often used in oil-cooled electrical transformers. They can also make up venting parts for gearboxes.

Mobile equipment (such as petrol tankers) has breather caps fitted to prevent explosions due to the motion of combustible materials in transit.

Types of hydraulic breather caps

Some hydraulic breather caps have added valves (double or vacuum) and others come with dipstick options. These caps can also have attached sealing discs that prevent hydraulic fluid leakage and keep dust particles out. Breather caps come in threaded, screw-on or bayonet configurations.


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Description Price Filtration Size Connection Thread Cap Diameter Colour Cap Material Finish Maximum Operating Temperature Thread Size Thread Standard
RS Stock No. 729-026
Mfr. Part No.H00279001
BrandParker
PHP1,553.81
Each
units
70µm G 1/4 35mm - - - +90°C 1/4 -
RS Stock No. 729-032
Mfr. Part No.H00279003
BrandParker
PHP1,196.66
Each
units
70µm G 1/2 35mm - - - +90°C 1/2 -
RS Stock No. 283-3161
Mfr. Part No.54101
PHP203.48
Each
units
- G 1/2 31mm Orange Polyamide Semi Matte +120°C 1/2in G
RS Stock No. 914-9488
Mfr. Part No.56261
PHP317.07
Each
units
- G 1 57mm Orange Polyamide Semi Matte +100°C 1in G
RS Stock No. 364-1373
Mfr. Part No.54611
PHP220.09
Each
units
- M16 x 1.5 31mm Orange Polyamide Semi Matte +120°C - Metric
RS Stock No. 283-3183
Mfr. Part No.56671
PHP299.37
Each
units
- G 1/2 42mm Orange Polyamide Semi Matte +120°C 1/2in G
RS Stock No. 237-8743
Mfr. Part No.AB685101
BrandParker
PHP1,038.24
Each
units
10µm G 3/8 70mm Black Glass Filled Nylon - - 3/8 -
RS Stock No. 914-9485
Mfr. Part No.56241
PHP317.07
Each
units
- G 3/4 57mm Orange Polyamide Semi Matte +100°C 3/4in G
RS Stock No. 914-9472
Mfr. Part No.56151
PHP154.50
Each
units
- G 1/4 31mm Orange Polyamide Semi Matte +100°C 1/4in G
RS Stock No. 283-3228
Mfr. Part No.54661
PHP271.79
Each
units
- G 3/8 31mm Orange Polyamide Semi Matte +120°C 3/8in G
RS Stock No. 283-3234
Mfr. Part No.54671
PHP261.68
Each
units
- G 1/2 31mm Orange Polyamide Semi Matte +120°C 1/2in G
RS Stock No. 333-1111
Mfr. Part No.SAB.1563.40
BrandParker
PHP880.33
Each
units
40µm G 1/4 - Orange - - - 1/4 -
RS Stock No. 283-3212
Mfr. Part No.54651
PHP284.33
Each
units
- G 1/4 31mm Orange Polyamide Semi Matte +120°C 1/4in G
RS Stock No. 364-1294
Mfr. Part No.53911
PHP143.98
Each
units
- G 1/2 31mm Orange Polyamide Semi Matte +120°C 1/2in G
RS Stock No. 283-3149
Mfr. Part No.53935
PHP218.36
Each
units
- G 1/4 31mm Orange Polyamide Semi Matte +120°C 1/4in G
RS Stock No. 153-3752
Mfr. Part No.54011-EX
BrandElesa
PHP9,193.28
1 Bag of 10
Bag(s)
40µ G 3/8 31mm Black, Orange Technopolymer Semi Matte +80°C 0.375in G
RS Stock No. 364-1288
Mfr. Part No.53901
PHP165.83
Each
units
- G 3/8 31mm Orange Polyamide Semi Matte +120°C 3/8in G
RS Stock No. 364-1323
Mfr. Part No.53931
PHP239.99
Each
units
- G 1 42mm Orange Polyamide Semi Matte +120°C 1in G
RS Stock No. 914-9479
Mfr. Part No.53933
PHP272.04
Each
units
- G 1 1/2 57mm Orange Polyamide Semi Matte +100°C 1-1/2in G
RS Stock No. 364-1317
Mfr. Part No.53921
PHP200.61
Each
units
- G 3/4 42mm Orange Polyamide Semi Matte +120°C 3/4in G
Related Products
SFP+a-EX breather caps come complete with splash guard ...
Description:
SFP+a-EX breather caps come complete with splash guard device (ELESA original design) that prevents oil loss and are particularly suitable for use where oil is violently agitated and could be splashed against breather cap.
SFP-EX breather caps come complete with splash guard ...
Description:
SFP-EX breather caps come complete with splash guard device (ELESA original design) that prevents oil loss and are particularly suitable for use where oil is violently agitated and could be splashed against breather cap.
Resistant to solvents, oils, greases and other chemical ...
Description:
Resistant to solvents, oils, greases and other chemical agentsComplete with ELESA patented splash guard device that prevents oil loss Fitted with integral splash guard and suitable for use where oil is violently agitatedPolyamide Technopolymer constructionNBR synthetic rubber sealMaximum Temperature: 120°C. ...
Resistant to solvents, oils greases and other chemical ...
Description:
Resistant to solvents, oils greases and other chemical agentsCap has a valve which opens when pressure exceeds 10 mbThis type of valve breather cap is used when air that has exceeded a certain pressure has to be expelledA sealing disc ...