JW Winco

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GN 556 Breather caps with 2 function descriptions


ELESA Original design
code: SFC.

Product description


GN 556 breather caps are used when the ventilation / breathing function is temporarily not required or desired, for instance during transport.

In their sealing position, the two O-rings prevent liquids and gases from leaking.

As shown in the diagram opposite, air throughput is permitted in the ventilation / breathing position.


  • temperature resistant up to 80 °C
  • black, matte

Upper part (cap)
Polyamide (PA)

Lower part (threaded part)
Polyacetal (POM)

Sealing ring rubber NBR (Perbunan)

Air filter PU-foam (Polyurethane)
Filtration 10 µm


Technical drawing

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GN 556 Breather caps with 2 function descriptions sketch

Article options / Table

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30G 3/829399335

Build & Price

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Outside diameter d1
Thread d2

Assembly instruction

Sketch GN 556 step 1

Screw in lower part using an Allen® wrench.

Sketch GN 556 step 2

Insert filter.

Sketch GN 556 step 3

Place upper part on top. The knobs on the upper part and the appropriate recesses in the lower part serve to assemble the unit in the proper and accurate position.

Sketch GN 556 step 4

Ventilation / breather position:
Turn upper part clockwise (CLOSE arrow) up to the first latch position. Marker 1 is located above the reference pointer. The latching mechanisms prevents the upper part from inadvertently working loose.

Sketch GN 556 step 5

Close position:
Continue to turn the upper part clockwise (CLOSE arrow) until marker 0 is located above the reference pointer. The latching mechanism prevents the upper part from working loose also in this position.

Sketch GN 556 step 6

To return to the ventilation / breathing position or for changing the filter of for dismantling, turn the upper part anti-clockwise as shown by the OPEN arrow.

Factor of air flow rate/pressure difference

Sketch GN 556 info

Air flow rate [l/min.] is a factor of the pressure
difference [l/min.] between container and ambient air.

Selected Part (How to order)

Total (net)
plus VAT 2,09 €
gross 15,16 €
Delivery time 5-8 days
Weight: 0,018 kg
If this article is new in our product range, it may happen that details concerning weight are as yet not listed.
If you do need weight details, please contact our Sales Department!
Phone+49 7723 6507 - 0
RoHS: Yes
This article is RoHS-compliant in application of Annex III., which means it complies with EU Directive 2011/65/EU, including extension (2015/863/EU), for restricting the use of certain hazardous substances in electrical and electronic devices. The Directive regulates the use of hazardous substances in devices and components. The implementation in national law is summarily described with RoHS(Restriction of (the use of certain) hazardous substances)).
Please note our quantity discounts.
With a total value (net) per order:
from 175,00 € -> 10 % discount
from 275,00 € -> 20 % discount
from 375,00 € -> 30 % discount
With a total value (net) per order:
All prices in accordance with our price list No. 52, valid from 1 May 2019, plus VAT only valid for Germany.

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