Continental Trade Sp. z o. o.


Typ 350 - PN3

Type 350 - PN3

Product withdrawn from the offer!

We no longer offer the type 350 sight glass !
Instead, we recommend a type 435 sight glass that is a modernized replacement for type 350 sight glass.

The following information is for archival purposes only and is no longer the subject of our commercial offer.

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.


Type 350 sight glasses are a series of   rectangular sight glasses characterized by a solid construction and a large field of observation. In the event of contact with aggressive media, we recommend using protective layers such as mica, KEL-F, PRFE or FEP to protect the glass surface from chemical and thermal influences.

In addition to borosilicate glass (described in the industry standard DIN 7081), we also use cheaper soda-lime glass (in accordance with DIN 8903) in the case where     your application   does not require high temperature resistance  .

The seal is made, as with most of our sight glasses, with flat high quality gaskets such as KlingerSIL C4400   or highly chemically resistant PTFE   in untreated or expanded form. Soft, but durable,   gaskets, such as silicone, EPDM or NBR, can also be installed at the factory.

As flange material, you can choose from our whole catalogue of high-quality types of steel and stainless steel, such as S235, 1.4571 or 1.4541. The internationally widespread stainless steel 1.444 is also available, along with high-performance alloys such as Hastelloy or duplex steel.

If it is necessary to replace the glass or seal, our competent team of technical and sales consultants will help to provide a solution as quickly as possible.

Additional technical data, detailed descriptions and contact details can be found   below.

Technical data


Base & cover flange:
S235JRG2, 1.4571; 1.4404

Glass plates: 
Szkło borokrzemowe wg DIN 7081
Szkło sodowo-wapniowe wg DIN 8903

Sealing: typical high quality materials
(Other materials available on request)

Rectangular sight glass as a level indicator and for visual inspection of tanks, boilers and silos

Nominal size:
size from 270 mm up to 760 mm

Nominal pressure:
For pressure up to max. 3 bar

Temperature: 70°C, 100°C or 243°C depending on the glass and gasket.
Higher operating temperatures on request

Optional versions are possible.

Download data sheet:

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

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