Continental Trade Sp. z o. o.


Type 334 - PN3

Rectangular level indicator sight glass for visual observation of fluid levels in vessels, boilers and silos. Intended for welding into the tank wall. Provides a large field of observation. It can also be used as a level indicator (liquid level indicator). The successor to the type 350 sight glass fittings.


The ACI tank sight glass type 334 is a light construction, which offers a considerably enlarged sight opening compared to our type 330 at a rather low operating pressure up to max. 3 bar. Due to this design the type 334 combines the functions of our round tank sight glasses like the type 318 and our level indicators for tank wall mounting type 330.

Like our other sightglasses, the tank sightglass type 334 may not only be equipped with the highly resistant and industry-proven borosilicate glass, but also with quartz glass or the particularly robust and scratch-resistant sapphire glass for your most demanding applications.

For sealing, we use flat gasket materials from well-known manufacturers, which we select based on your individual requirements. We use the proven C4400 aramid fibre gaskets from KlingerSIL for many applications. At high temperatures, we rely on novaphit MST from Frenzelit, and in chemically demanding applications such as strong acids, the sight glass is sealed with pure or expanded PTFE.

The tank sight glass type 334 is delivered hand-tight pre-assembled at the factory. After welding in the base flange, the gaskets supplied are fastened together with the sight glass through the cover flange, whereby even very low tightening torques are sufficient to achieve sufficient contact pressure.

If unexpectedly a damage of the sight glass should occur during operation, our competent team of technicians and merchants will be at your disposal at any time to provide replacement as quickly as possible.

Read on for technical details or watch the product video above in the slider.

Technical data


Base flange:
1.4571, 1.4404, 1.4435, 1.4462, 1.4539, 1.4541, 2.4602, 2.4610, P265GH, Alloy , Super Duplex

Cover flange:
1.4571, 1.4404, 1.4435, 1.4462, 1.4539, 1.4541, 2.4602, 2.4610, P265GH, Alloy , Super Duplex

DIN 912, A4-70 or special materials

Glass plates:
Borosilicate glass similar to DIN 7081
(other materials available)

oval rectangular sightglass fitting
for welding in or on

Nominal size:
from 270 to 760 mm

Nominal pressure:
for operating pressures up to 3 bar
(Vacuum version available on request)

Optional versions are possible.

100°C or 243°C
depending on glass and gasket selection.

Gasket selection:
  PTFE (200°C)
  FKM (200°C)
  NBR (100°C)
  C4400 (150°C)
  Silicone (200°C)
  EPDM (140°C)
  Graphite (280°C)

Download data sheet:

While every attempt has been made to verify the source of the information, no responsibility is accepted for accuracy of data.

Information clause

What personal data are processed and who is their administrator?

When using our services, personal data that we process may be, for example, the IP address of your device, data obtained from cookies or similar mechanisms for recording information in Users' devices, as long as they allow you to identify you. More information about the scope of personal data and cookies can be found in the Cookies policy and in Privacy policy.

Administrator, ie the entity deciding on which personal data will be processed and for what purpose, and in what way, is Continental Trade Sp. z o.o. (hereinafter "Continental Trade" or "We") with its registered office and address in Warsaw at Krasnobrodzka Street 5.

What is the purpose and basis of the processing of your personal data by Continental Trade ?

Continental Trade processes your personal data to enable you to use our services, match the displayed content and ads to your interests, measure quality and effectiveness, improve content and services.

The basis for the processing of personal data is the legitimate interest of Continental Trade. It includes improving services, ensuring their best quality and informing Users about them.

Confirming that you have read this information,   by clicking on "Go to website" or closing this window at the same time you agree that your personal data will be processed in the same way as described here. You can manage your consent, including withdrawal.

Providing personal information is voluntary.

What are your rights to   Continental Trade in terms of processed data?

You can request from Continental Trade: access to data, rectification, deletion, transfer and, in some cases, processing restrictions, and you have the right to object to the processing of your personal data when personal data are processed on the basis of the legitimate interest of the administrator. You have the right to file a complaint regarding the processing of your personal data to the President of the Office of Personal Data Protection.

To whom does Continental Trade share your personal data?

Continental Trade, in principle, does not share your personal data with third parties, except for situations in which Continental Trade has a legal basis, including at the request of authorized entities, or when it is necessary to perform services offered by Continental Trade, e.g. entrepreneurs providing hosting of our services.

How long does Continental Trade store your personal data?

Continental Trade stores Users' personal data only for the time that is necessary to achieve the purposes for which the data was collected and provided that one of the legal grounds described above is up-to-date or when a new ground has appeared, e.g. a law or the need to enforce claims in court proceedings.

Who can you contact for more information on the processing of personal data by Continental Trade?

If you have questions related to the processing of your personal data on websites operated by Continental Trade or would like to report the issue related to the processing of personal data by Continental Trade, you can contact a Continental Trade representative using the contact information:

More information on the protection of your personal data can be found in the Cookie Policy and Security Policy documents published on our website