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GN 775 Breather Caps Plastic, with Filter and Double Valve


GN 775 Breather Caps, Vandalism Proof, Plastic
ELESA original design
code: SFW / VP.

Product description


Function and operational criteria of breather caps GN 775 see description of function.

In addition, breather caps GN 775 are known for the following properties:

a torque limiter is installed in the mechanism which is set to give the optimum torque to ensure a perfect seal on installation,
once screwed in position, they can only be removed with a special key,
with this vandalism proof function, the breather caps cannot be tampered with or removed by an unauthorised person.

The connection between upper part (cap) and lower part (threaded part) conforms to protection class 65.

Breather caps are supplied with two keys each.



  • Temperature resistant up to 120 °C
  • Black
  • Upper part (cap)
    Polyamide (PA)
  • Lower part (threaded part)
    Polyacetal (POM)

Sealing ring
NBR (Perbunan)

Air filter PU-foam (Polyurethane)
Filtration 40 µm

Plastic, red

Insert profile
Stainless steel sheet

Pressure spring
Stainless steel


Technical drawing

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GN 775 Breather Caps, Vandalism Proof, Plastic sketch

Article options / Table

Show / Hide columns
d1d1Opening pressure in mbar
at tank overpressure
Opening pressure in mbar
at tank vacuum
G 3/4-350700*303616155,568
-M 42 x 2350700*30473221474
* not available from stock, requires a minimum order quantity

Build & Price

Open 3D configurator
Inch thread d1
Fine thread d1
Opening pressure Öffnungsdruck

Description of function

Skizze Funktion GN 775

Breather caps GN 775 with double valve are normally used if the oil container is under pressure and if outside air has to flow back in to compensate for the vacuum caused by falling oil level.

This is achieved by combining two valves (non-return / bypass valve). The inlet valve opens at a vacuum of 30 mbar or greater. The second valves opens at an overpressure > 350 / 700 mbar.

The air filter prevents the oil from being polluted from the outside (dust). The filter is made of PU foam with a filtration of 40 µm.

The over pressure inside the container ensures that the air volume flowing in or escaping owing to fluctuations of the oil level is kept to a minimum. This reduces filter fouling and substantially increases the useful filter life, especially in a dusty environment.

Also, a container under pressure has a positive effect on the function of the pump and prevents foaming.

The valve seal ensures that no oil will leak even if the oil is heavily agitated or during transport.

Sketch GN 775 pressure

Pressure curve Δp [mbar] in the container as factor of the air flow rate [l/min.] at a valve opening pressure of 350 or 700 mbar.

Assembly instruction

Sketch GN 775 assembly

When turning in the cap, a latching mechanism ensures that the specified torque is not exceeded. It is set for optimum sealing effect. Turning out the cap without a key is no longer possible.

When turning in the cap, the key must not be inserted.

For turning out the cap, turn the cap clockwise to the stop (latching mechanism). Insert the key into the recess in this position. This will connect the screw-in thread and the cap, allowing the breather cap to be removed.
The key is designed such that, when inserted, it can be clipped to the cap.

Selected Part (How to order)

Total (net)
plus VAT 9,10 €
gross 57,00 €
In stock
ELESA Code: 54961
Description: SFW.80-VP-3/4-F-350mb
Weight: 0,176 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 order discounts.
With a total value (net) per order:
from 175,00 € -> 10 % discount
from 275,00 € -> 20 % discount
from 375,00 € -> 30 % discount

Surcharge for small volume purchases:
-> 15,00 Euro
for value of goods less than 25,00 €
-> 10,00 Euro
for value of goods from 25,00 to 49,99 €
All prices in accordance with our price list No. 55, valid from 1 September 2022, plus VAT only valid for Germany.

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