EN 774 Breather Valve Caps Plastic, with or without Dipstick, with Double Valve


EN 774 Plastic Breather Valve Caps, with or without Dipstick, with Double Valve Type: A - Without dipstick
ELESA original design

code: SFW.
Type: A - Without dipstick
EN 774 Plastic Breather Valve Caps, with or without Dipstick, with Double Valve Type: A - Without dipstick EN 774 Plastic Breather Valve Caps, with or without Dipstick, with Double Valve Type: B - With dipstick

Product description


For function and operational criteria of breather valve caps EN 774 with double valve, see description of function.

Breather valve caps can be mounted either with a thread or a bayonet mount (BA) and can be combined with an EN 664 or EN 664.1 filler strainer.

The bayonet mount version can be secured against loss by means of the chain.

The dipstick has two flat sides on which the MIN-MAX markings can easily be applied (see GN 109).


Technopolymer (Polyamide PA)

  • Temperature resistant up to 212 °F (100 °C)
  • Upper part (cap)
    Orange, RAL 2004
  • Lower part (screw-in thread / bayonet mount)
    Black, matte finish

Rubber NBR (Perbunan®)

Air filter
PU foam (Polyurethane)

  • Grade of filtration 40 µm
  • Temperature resistant up to 212 °F (100 °C)

Steel, phosphate-treated


On request

Fluid level markings / special lengths
see GN 109

Technical drawing

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EN 774 Plastic Breather Valve Caps, with or without Dipstick, with Double Valve sketch

Part Options / Table


AWithout dipstick
BWith dipstick
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Dimensions in: Inch (change to Metric)
Pipe thread
Type A

Type B

Bayonet mount
Opening pressure
in mbar
2.24G 3/4--350700*1.380.632.200.510.241.89---
2.76G 3/4G 3/4-350700*1.380.632.680.590.242.48--7.40
2.76G 1 1/4G 1 1/4-350700*-0.982.680.67-2.32--7.68
2.76G 2--350700*-0.982.680.67-2.32---
2.76--BA 39350700*-0.982.68---0.552.207.68
* Not available from stock, requires a minimum order quantity

Build & Price

3D Product Configurator
Diameter d1
Pipe thread d2
Bayonet mount d2
Opening pressure

Description of Function

Sketch Function GN 774

EN 774 breather valve caps with double valve are normally used when the fluid container is under pressure, yet air has to flow in from the outside in case of underpressure (decreasing fluid level).

This is achieved by combining two valves (check / bypass valve). The inlet valve allows air to enter at an underpressure of 30 mbar or higher. The second valve only opens at an overpressure of > 350 / 700 mbar.

The air filter prevents contamination of the fluid from outside (dust). It is made of PU foam with a grade of filtration of 40 µm.

The overpressure inside the container ensures that the air volume, which is flowing in or escaping due to the fluctuating fluid level, is kept to a minimum. This reduces filter fouling and substantially increases the service life, especially in dusty environments.

In addition, a pressurized container has a positive effect on the function of the pump and prevents the formation of foam.

The valve seal ensures that no fluid will leak, especially if the fluid is strongly moved or during transport.

Skizze Diagramm GN 774

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

GN 109 Fluid Level Markings / Special Lengths (Special Order)

GN 109

For the series with dipstick shown above, a shortening and / or the attachment of level markings can be ordered with the service GN 109.
The dipstick is shortened to the length l1 and the marking notches are milled at l2 or l3, making them easily visible. The max. length l1 is specified in the respective series. The length specifications l1 to l3 refer to the contact surface without seal, with a tolerance of ±1 mm to be taken into account. For critical applications, the seal must be taken into consideration with a thickness of up to 2 mm, depending on the series.
If required, more than 2 notches may be inserted on request, which are then specified by appropriate details on the position (l4 ... lx). Furthermore, texts such as MAX / MIN may be laser-engraved in addition to or instead of the notches by submitting the appropriate template.

The fluid level markings / special lengths GN 109 are to be ordered as a separate item in shopping cart step 1 under note.

How to order GN 109

Selected Part

Total US Dollars (net)
Call / Email for Delivery Time
Please note our quantity discounts (US Dollars).
≥ 250$37.11
Prop 65: -
Please contact our Sales Department for more information.
RoHS: -
No details on RoHS compatibility are available at this time. Please contact our Sales Department for more information.
Weight: 0.152 lbs
If weight is not listed, please contact our Sales Department for additional information regarding weight.
Phone: 800-877-8351
All Prices are in US Dollars. Taxes Not Included.

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Need Help?

Our service team is available from Monday to Friday between 7:30 AM and 5:00 PM Central Time: 800-877-8351

Special Requests | Contact our sales team

EN 774-57-G3/4-350-AEN 774-57-G3/4-700-AEN 774-70-G3/4-350-AEN 774-70-G3/4-350-BEN 774-70-G3/4-700-AEN 774-70-G3/4-700-BEN 774-70-G11/4-350-AEN 774-70-G11/4-350-BEN 774-70-G11/4-700-AEN 774-70-G11/4-700-BEN 774-70-G2-350-AEN 774-70-G2-700-AEN 774-70-BA39-350-AEN 774-70-BA39-350-BEN 774-70-BA39-700-AEN 774-70-BA39-700-B

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