Welcome: Professional Supplier of Plastic Pipe Valve Fittings
cindyli@swdplastic.com +86-574-88324025

Industrial Plastic Sight Glass

Size: DN15-DN200
Lead time: 30 days around
MOQ: 10Ctns
Delivery: Ocean or Express
Port: Ningbo or Shanghai
Place of origin: China


The plastic sight glass is assembled with tempered borosilicate glass, polyethylene tetrafluoro gasket and plastic flange. Installed on pipelines or equipment, you can view and monitor the work of internal materials at any time. It is suitable for most harsh working environments and has a long service life. It is one of the main accessories on industrial pipeline devices. In the pipelines of petroleum, chemical, pharmaceutical, food and other industrial production devices, the visual cup can observe the flow and reaction of liquid, gas, steam and other media in the pipeline at any time, which can monitor production, The role of avoiding accidents in the production process. The structure is compact, the installation is simple, the use is convenient, and it is very easy to clean and maintain. It is the most commonly used product at present.

Main technical parameters of plastic sight glass:

1. Mirror body material: UPVC,CPVC,PPH,PVDF

2. Mirror glass material: soda lime glass, tempered borosilicate glass, quartz glass, plexiglass.

3. Sight glass sealing material: Nitrile rubber, PTFE, graphite composite.

4. Working pressure of sight glass: 0.6~2.5Mpa

5. Working temperature of sight glass: -40℃~140℃

6. Sight glass connection standard: flange connection

Plastic sight glass installation and maintenance instructions:

1. Plastic sight glass is a flow reaction equipment for observing liquid, gas, steam and other media, and its window glass should be kept clean and free of dust.

2. The plastic sight glass is a vulnerable part, so be careful when installing the sight glass.

3. The temperature and pressure resistance of the plastic sight glass tube has certain limitations. Please strictly implement the regulations in the manual.

4. The allowable abrupt change temperature is less than 60 ℃, and the glass will break due to excessive temperature difference.

1.Base Material:UPVC,CPVC,PPH,PVDF

2.Hex nuts MaterialSteel

3. Double headed stud MaterialSteel

4. Glass MaterialGlass

5.Washers Material: EPDM,FPM

6. Base MaterialUPVC,CPVC,PPH,PVDF

sight glass assembly detail drawing.jpg

Sight Glass Drawing.jpg

DN (mm)D1D2Lhn-∮
32 (11/4")1501001003.45230164-∮184-∮194-∮16
40 (11/2")1501101053.88230164-∮184-∮194-∮16
50 (2")1651251204.74233174-∮184-∮194-∮19
65 (21/2")1951451405.49277204-∮184-∮194-∮19
80 (3")1951601506277208-∮184-∮194-∮19
100 (4")2151801757.5310218-∮188-∮198-∮19
125 (5")2502102108.5350268-∮188-∮238-∮22
150 (6")2852402409.51385278-∮238-∮238-∮22
200 (8")34029529011.75400258-∮23


1. Our valves are fully inspected to ensure that they do not leak and feel right in the hand.                         

2. We send the same quantity of products free or send payment back once customers find a problem when getting goods.

3. We will reply to you within a workday and come up with solutions within 5 workdays when we receive your claim.

4. We will reply to you within a workday when receiving your inquiry.


1. What is your MOQ?   

Our MOQ is usually 10 CTNS.   

2. What is your delivery time?   

The time of delivery is around 30-45days.

3. What is the shipping port?   

ShanghaiNingbo、 XiamenShenzhenGuangzhou

4. What are your payment terms?  

We accept 30% T/T in advance,70% against the copy of  B/L, or 100% L/C.

5. How should I contact you?  

You can contact us with Trade Manager or send us an email by clicking Contact Supplier bottom.

6. What is the location of your company?

Our company is located in Ningbo, Zhejiang Province, China. If you would like to visit, you are much welcome.

7. How about the samples?  

We could send you the samples, most samples are free to send to most places in China. If sent to other countries, transport fee should be paid by you.

Our Services.png

1. Any inquiries will be replied to within 24 hours  

2.No leakage, pressure PN 10;  

3. Well and high-quality control ;  

4. Environment-friendly, non-toxic, good-looking, and long service life;

5. Lightweight, easy to handle and transport;

6. Soft colors and excellent design, suitable for installation either exposed or hidden;  

7. Wonderful ability in chemical corrosion resistance;  

1. Genuine products with excellent quality and competitive prices.

2. Cooperating with customers all over the world and knowing the markets very well.

3. We are a reputable company, the company has passed BV and SGS third-party certification.

4. After- Services will be highly-satisfied. Any problems and feedback will be answered in a short time.


Mob&Whatsapp: 0086 15869351645

Tel: 0086-574-88324025

Email: cindyli@swdplastic.com