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. 237-8765
Mfr. Part No.AB.687101.UC
BrandParker UCC
£15.19
Each
Units
10µm G 3/4 - Black Glass Coupled PP, Glass Filled Nylon - - 3/4 -
RS Stock No. 364-1373
Mfr. Part No.54611
£3.93
Each
Units
- M16 x 1.5 31mm Orange Polyamide Semi Matte +120°C - Metric
RS Stock No. 333-1111
Mfr. Part No.SAB.1563.40
BrandParker
£14.57
Each
Units
40µm G 1/4 - Orange - - - 1/4 -
RS Stock No. 729-032
Mfr. Part No.H00279003
BrandParker
£19.82
Each
Units
70µm G 1/2 35mm - - - +90°C 1/2 -
RS Stock No. 283-3234
Mfr. Part No.54671
£4.26
Each
Units
- G 1/2 31mm Orange Polyamide Semi Matte +120°C 1/2in G
RS Stock No. 364-1323
Mfr. Part No.53931
£3.20
Each
Units
- G 1 42mm Orange Polyamide Semi Matte +120°C 1in G
RS Stock No. 283-3161
Mfr. Part No.54101
£3.58
Each
Units
- G 1/2 31mm Orange Polyamide Semi Matte +120°C 1/2in G
RS Stock No. 283-3155
Mfr. Part No.54001
£2.95
Each
Units
- G 3/8 31mm Orange Polyamide Semi Matte +120°C 3/8in G
RS Stock No. 283-3149
Mfr. Part No.53935
£2.91
Each
Units
- G 1/4 31mm Orange Polyamide Semi Matte +120°C 1/4in G
RS Stock No. 729-026
Mfr. Part No.H00279001
BrandParker
£22.89
Each
Units
70µm G 1/4 35mm - - - +90°C 1/4 -
RS Stock No. 283-3199
Mfr. Part No.54201
£3.62
Each
Units
- G 3/4 42mm Orange Polyamide Semi Matte +120°C 3/4in G
RS Stock No. 364-1288
Mfr. Part No.53901
£2.33
Each
Units
- G 3/8 31mm Orange Polyamide Semi Matte +120°C 3/8in G
RS Stock No. 329-1546
BrandParker
£15.57
Each
Units
10µm G 3/4 101mm - Glass Filled Nylon - +90°C 3/4 -
RS Stock No. 283-3212
Mfr. Part No.54651
£3.93
Each
Units
- G 1/4 31mm Orange Polyamide Semi Matte +120°C 1/4in G
RS Stock No. 364-1294
Mfr. Part No.53911
£2.33
Each
Units
- G 1/2 31mm Orange Polyamide Semi Matte +120°C 1/2in G
RS Stock No. 283-3240
Mfr. Part No.54681
£6.27
Each
Units
- G 3/4 42mm Orange Polyamide Semi Matte +120°C 3/4in G
RS Stock No. 283-3206
Mfr. Part No.54301
£4.07
Each
Units
- G 1 42mm Orange Polyamide Semi Matte +120°C 1in G
RS Stock No. 329-1530
Mfr. Part No.AB98610101
BrandParker
£15.57
Each
Units
10µm G 1/2 101mm - Glass Filled Nylon - +90°C 1/2 -
RS Stock No. 283-3256
Mfr. Part No.54691
£6.41
Each
Units
- G 1 42mm Orange Polyamide Semi Matte +120°C 1in G
RS Stock No. 914-9472
Mfr. Part No.56151
£2.33
Each
Units
- G 1/4 31mm Orange Polyamide Semi Matte +100°C 1/4in G
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