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. 283-3149
Mfr. Part No.53935
HK$27.05
Each
units
- G 1/4 31mm Orange Polyamide Semi Matte +120°C 1/4in G
RS Stock No. 283-3183
Mfr. Part No.56671
HK$34.19
Each
units
- G 1/2 42mm Orange Polyamide Semi Matte +120°C 1/2in G
RS Stock No. 364-1373
Mfr. Part No.54611
HK$34.51
Each
units
- M16 x 1.5 31mm Orange Polyamide Semi Matte +120°C - Metric
RS Stock No. 364-1323
Mfr. Part No.53931
HK$31.16
Each
units
- G 1 42mm Orange Polyamide Semi Matte +120°C 1in G
RS Stock No. 914-9472
Mfr. Part No.56151
HK$20.87
Each
units
- G 1/4 31mm Orange Polyamide Semi Matte +100°C 1/4in G
RS Stock No. 914-9476
Mfr. Part No.56181
HK$28.85
Each
units
- G 3/8 42mm Orange Polyamide Semi Matte +100°C 3/8in G
RS Stock No. 364-1317
Mfr. Part No.53921
HK$24.65
Each
units
- G 3/4 42mm Orange Polyamide Semi Matte +120°C 3/4in G
RS Stock No. 914-9479
Mfr. Part No.53933
HK$49.37
Each
units
- G 1 1/2 57mm Orange Polyamide Semi Matte +100°C 1-1/2in G
RS Stock No. 914-9488
Mfr. Part No.56261
HK$44.96
Each
units
- G 1 57mm Orange Polyamide Semi Matte +100°C 1in G
RS Stock No. 283-3256
Mfr. Part No.54691
HK$66.00
Each
units
- G 1 42mm Orange Polyamide Semi Matte +120°C 1in G
RS Stock No. 914-9485
Mfr. Part No.56241
HK$46.35
Each
units
- G 3/4 57mm Orange Polyamide Semi Matte +100°C 3/4in G
RS Stock No. 283-3161
Mfr. Part No.54101
HK$36.10
Each
units
- G 1/2 31mm Orange Polyamide Semi Matte +120°C 1/2in G
RS Stock No. 283-3240
Mfr. Part No.54681
HK$60.26
Each
units
- G 3/4 42mm Orange Polyamide Semi Matte +120°C 3/4in G
RS Stock No. 283-3199
Mfr. Part No.54201
HK$37.20
Each
units
- G 3/4 42mm Orange Polyamide Semi Matte +120°C 3/4in G
RS Stock No. 364-1294
Mfr. Part No.53911
HK$28.32
Each
units
- G 1/2 31mm Orange Polyamide Semi Matte +120°C 1/2in G
RS Stock No. 914-9460
Mfr. Part No.53932
HK$46.35
Each
units
- G 1-1/4 57mm Orange Polyamide Semi Matte +100°C 1-1/4in G
RS Stock No. 364-1288
Mfr. Part No.53901
HK$26.44
Each
units
- G 3/8 31mm Orange Polyamide Semi Matte +120°C 3/8in G
RS Stock No. 283-3155
Mfr. Part No.54001
HK$30.40
Each
units
- G 3/8 31mm Orange Polyamide Semi Matte +120°C 3/8in G
RS Stock No. 283-3234
Mfr. Part No.54671
HK$37.15
Each
units
- G 1/2 31mm Orange Polyamide Semi Matte +120°C 1/2in G
RS Stock No. 283-3212
Mfr. Part No.54651
HK$34.51
Each
units
- G 1/4 31mm Orange Polyamide Semi Matte +120°C 1/4in G