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Breather Vent Plugs 

GrandMfg®Breather vents, Air Vent Plugs, Vent breather Plugs, Breather Plugs, Breather drain plugs, vent plugs, Air released plugs,Air releasing fitting,Breather cap,Enhanced Brass Breather Vent,breather vent valve,Hydraulic Breather Cap
Material: Brass, aluminum and steel
Finish:  Natural and Nickel Plated

Thread Type:  BSP,Metric,NPT and Any Size OEM are welcome.
Metric thread: M8 to M60

NPT thread: NPT1/8” to NPT1”

BSP thread: G1/8” to G2”

Precision control pressure type:

Working Pressure range:  0.01 MPa to 0.03MPa(0.1bar to 0.3bar).

Working Temperature Range:  -30 Celsius Degree to 180 Celsius Degree.

Function: Allow Sealed Pressure Systems to Vent Off Excess Pressure as Heat in System Builds up, Air Pressure is Allowed Back into System as System Cools,Protective cap prevents water or dirt from entering.Keep the system working in a certain low and good pressure improving the transmission efficiency.

Brass/SS304 filter type: 40-60  Micron brass filter or Stainless steel 304 filter.

Function: Allow Sealed Pressure Systems to Vent Off Excess Pressure as Heat in System Builds up, Air Pressure is Allowed Back into System as System Cools,Protective cap prevents water or dirt from entering.

Usage: Pump, Single Acting cylinders or valves, Crank Cases, Storage Tanks,Thin-wall container, Radiator, Hydraulic tanks,hydraulic reservoir,Hydraulic Cylinders, receivers,manifolds,Gearboxes, Speed Reducer, Compressor and Power Transmission.

 

Brass Breather Air Vent Plugs(Metric Thread & BSP)
Item No. A B C D E Size F L SW
GM-BVM10 11 5 3 9 M10x1 14 24 12
GM-BVM12 11 5.5 3 10 M12x1.5 17 24.5 14
GM-BVM14 11 5.5 3 10 M14x1.5 19 24.5 15
GM-BVM16 11 5.5 3 10 M16x1.5 22 24.5 17
GM-BVM18 11 5.5 3 10 M18x1.5 24 24.5 19
GM-BVM20 11 5.5 3 10 M20x1.5 26 24.5 19
GM-BVM22 11 5.5 3 10 M22x1.5 27 24.5 21
GM-BVM27 11 5.5 3 10 M27x1.5 32 24.5 24
GM-BVM33 11 5.5 3 10 M33x1.5 39 24.5 27
GM-BVG18 11 5 3 9 G 1/8"-28 14 24 12
GM-BVG14 11 5.5 3 10 G 1/4"-19 19 24.5 14
GM-BVG38 11 5.5 3 10 G 3/8"-19 22 24.5 17
GM-BVG12 11 5.5 3 10 G 1/2"-14 27 24.5 21
GM-BVG34 11 5.5 3 10 G 3/4"-14 32 24.5 24
GM-BVG10 11 5.5 3 10 G   1"-11 39 24.5 27
Air Releasing Pressure Range:0.015MPa to 0.03MPa(0.15Bar to 0.3Bar)

 

 

 

Circular Brass Breather Air Vent Plugs(Metric thread & BSPThread)
Item No. A B C D E Size F L SW
GM-CBVM10 11 8 5 2.5 M10x1 14 27 12
GM-CBVM12 11 8 5.5 3 M12x1.5 17 27.5 14
GM-CBVM14 11 8 5.5 3 M14x1.5 19 27.5 15
GM-CBVM16 11 8 5.5 3 M16x1.5 22 27.5 17
GM-CBVM18 11 8 5.5 3 M18x1.5 24 27.5 19
GM-CBVM20 11 8 5.5 3 M20x1.5 26 27.5 19
GM-CBVM22 11 8 5.5 3 M22x1.5 27 27.5 21
GM-CBVM27 11 8 5.5 3 M27x1.5 32 27.5 24
GM-CBVM33 11 8 5.5 3 M33x1.5 39 27.5 27
GM-CBVG18 11 8 5 3 G 1/8"-28 20 27 12
GM-CBVG14 11 8 5.5 3 G 1/4"-19 20 27.5 14
GM-CBVG38 11 8 5.5 3 G 3/8"-19 22 27.5 17
GM-CBVG12 11 8 5.5 3 G 1/2"-14 26 27.5 21
GM-CBVG34 11 8 5.5 3 G 3/4"-14 32 27.5 24
GM-CBVG10 11 8 5.5 3 G   1"-11 40 27.5 27
Air Releasing Pressure Range:0.01MPa to 0.03MPa(0.1Bar to 0.3Bar)

 

 

 

 

Hexagon Brass Breather Vent Plug(Metric & BSP Thread)
Item No. A B C D E Size d SW Remarks
GM-HBVM10 9 6 8 9 M10x1 18 19 Releasing Pressure Range:0.01MPa to 0.03MPa
GM-HBVM12 9 7 8 9 M12x1.5 18 19
GM-HBVM16 9.2 7 9 9 M16x1.5 18 20
GM-HBVM22 9.2 7 9 9 M22x1.5 18 24
GM-HBVM27 9.5 8 10 9 M27x1.5 18 27
GM-HBVM33 9.5 9 10 9 M33x1.5 18 36
 
GM-HBVG18 9 6 8 9 G 1/8"-28 18 19
GM-HBVG14 9 7 8 9 G 1/4"-19 18 19
GM-HBVG38 9.2 7 9 9 G 3/8"-19 18 20
GM-HBVG12 9.2 7 9 9 G 1/2"-14 18 24
GM-HBVG34 9.5 8 10 9 G 3/4"-14 18 27
GM-HBVG10 9.5 9 10 9 G   1"-11 18 36

 

 

 

Hexagon Brass Breather Vent Plug(NPT Thread)
Item No. A B C D E Size d SW Remarks
GM-HBVN18 9 6 12 9 G 1/8"-28 18 19 Releasing Pressure Range:0.01MPa to 0.03MPa
GM-HBVN14 9 7 13 9 G 1/4"-19 18 19
GM-HBVN38 9.2 8 13 9 NPT 3/8" 18 19
GM-HBVN12 9.5 9 17 9 NPT 1/2" 18 22
GM-HBVN34 9.5 9 18 9 NPT 3/4" 18 27
GM-HBVN10 9.5 10 21 9 NPT 1" 18 3

 

 

 

 

Hexagon Brass Breather Vent Plugs with filter(Metric Thread & BSP)
Item No. A B C D E Size d SW Remarks
GM-HBVM10-BF 10 1 9 8 M10x1 18 17 No Pressure with Brass FIller/SS304 Filter 
GM-HBVM12-BF 10 1 9 8 M12x1.5 18 17
GM-HBVM16-BF 10 1 9 9 M16x1.5 18 24
GM-HBVM22-BF 10 1 9 9 M22x1.5 18 27
GM-HBVM27-BF 10 1 10 10 M27x1.5 18 32
GM-HBVM33-BF 10 1 10 10 M33x1.5 18 36
               
GM-HBVG18-BF 10 1 9 8 G 1/8"-28 18 17
GM-HBVG14-BF 10 1 9 8 G 1/4"-19 18 17
GM-HBVG38-BF 10 1 9 9 G 3/8"-19 18 24
GM-HBVG12-BF 10 1 9 9 G 1/2"-14 18 27
GM-HBVG34-BF 10 1 10 10 G 3/4"-14 18 32
GM-HBVG10-BF 10 1 10 10 G   1"-11 18 36

 

 

 

Hexagon Brass Breather Vent Plugs with filler(NPT Thread)
Item No. A B C D E Size d SW Remarks
GM-HBVN18-BF 10 1 9 10.5 NPT1/8" 18 17 No Pressure Brass FIller/SS304 Filter 
GM-HBVN14-BF 10 1 9 11 NPT1/4" 18 17
GM-HBVN38-BF 10 1 9 12 NPT3/8" 18 19
GM-HBVN12-BF 10 1 9 14 NPT1/2" 18 22
GM-HBVN34-BF 10 1 9 17 NPT3/4" 18 27
GM-HBVN10-BF 10 1 9 20 NPT1" 18 34

 

 

 

Hexagon Brass Breather Vent Plug with filter(NPT Simple Plug)
Item No. A B C D E Size F(3) SW Remarks
GM-HBVN18-SP 15.2 8 7.2 5 NPT 3/8" 3.2 19 No Pressure with Brass FIller/SS304 Filler(NPT1/8 and 1/4" No filter) 
GM-HBVN14-SP 19.2 8 11.2 6 NPT 3/8" 3.2 21
GM-HBVN38-SP 19.4 8 11.4 8 NPT 3/8" 3.2 24
GM-HBVN12-SP 20.7 8.2 12.5 8.5 NPT 1/2" 3.2 29
GM-HBVN34-SP 23.8 9 14.8 8.5 NPT 3/4" 3.2 34
GM-HBVN10-SP 27.4 9 18.4 8.5 NPT 1" 3.2 41

 

 

 

Flat Brass Silencer Breather(BSP Thread)
Item No. A(Thread) B C D(SW) Remarks
GM-BSG18 G1/8" 5 10.5 12 Working Pressure:0-1MPa
GM-BSG14 G1/4" 7 12 17
GM-BSG38 G3/8" 8 14 19
GM-BSG12 G1/2" 9 15 22
GM-BSG34 G3/4" 9 15 27
GM-BSG10 G1" 11 20 36

 

 

 

 

Flat Brass Silencer Breather(PT Thread)
Item No. A(Thread) B C D(SW) Remarks
GM-BSPT18 PT1/8" 7 12 12 Working Pressure:0-1MPa
GM-BSPT14 PT1/4" 9 15 17
GM-BSPT38 PT3/8" 10 17 19
GM-BSPT12 PT1/2" 12 19 22
GM-BSPT34 PT3/4" 13 21 27
GM-BSPT10 PT1" 15 23 36

 

 

 

Flat Brass Silencer Breather(R Thread)
Item No. A(Thread) B C D(SW) Remarks
GM-BSR18 R1/8" 7 12 12 Working Pressure:0-1MPa
GM-BSR14 R1/4" 9 15 17
GM-BSR38 R3/8" 10 17 19
GM-BSR12 R1/2" 12 19 22
GM-BSR34 R3/4" 13 21 27
GM-BSR10 R1" 15 23 36

 

 

 

Flat Brass Silencer Breather(NPT Thread)
Item No. A B C D(SW) Remarks
GM-BSN18 NPT1/8" 7 12 12 Working Pressure:0-1MPa
GM-BSN14 NPT1/4" 9 15 17
GM-BSN38 NPT3/8" 10 17 19
GM-BSN12 NPT1/2" 12 19 22
GM-BSN34 NPT3/4" 13 21 27
GM-BSN10 NPT1" 15 23 36

 

 

Air Released plug
Air Released plug
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Breather Vents

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