GN 774 Breather caps Plastic, with filter, with double valve


GN 774 Breather caps with filter and double valve Type: A - without dipstick
ELESA original design
code: SFW./SFW+a
Type: A - without dipstick
GN 774 Breather caps with filter and double valve Type: A - without dipstick GN 774 Breather caps with filter and double valve Type: B - with dipstick (not available in size 57-G3/4 and size 70-G2)

Product description


Function and operational criteria of breather plugs GN 774 see function description.

Breather caps are fitted either with a threaded neck or with a bayonet connection and they can also be combined with a filler strainer GN 664 or GN 664.1.

The bayonet version is fitted with a chain to avoid losing it.

MAX-MIN markings can easily be added to the flats of a dipstick (see GN 109).


Plastic (Polyamide PA)
temperature resistant up to 100 °C
  • Upper part (cap)
    orange, RAL 2004OROR
  • Lower part (threaded part / bayonet)
    black, matt

Sealing ring rubber NBR (Perbunan)

Air filter PU-foam (Polyurethane)
  • Filtration 40 µm
  • temperature resistant up to 100 °C

Steel, phosphated

Level markings /
Special lengths GN 109


Technical drawing

Hide technical drawing
GN 774 Breather caps with filter and double valve sketch

Article options / Table


Awithout dipstick
Bwith dipstick (not available in size 57-G3/4 and size 70-G2)
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Opening pressure
in mbar
57G 3/4-350 Opening pressure700* Opening pressure35165613648---
70G 3/4-350 Opening pressure700* Opening pressure35166815663--188
70G 11/4-350 Opening pressure700* Opening pressure-256817-59--195
70G 2-350 Opening pressure700* Opening pressure-256817-59---
70-BA 39350 Opening pressure700* Opening pressure-2568---1456195
* not available from stock, requires a minimum order quantity

Build & Price

Outside diameter d1
Bayonet d2
Bayonet d2
Opening pressure


Breather caps GN 774 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 overpressure 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.

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.

Selected Part (How to order)

Weight: 0,067 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 Euro -> 10 % discount
from 275,00 Euro -> 20 % discount
from 375,00 Euro -> 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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