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https://www.gaugechina.com/products/4-inch-flush-diaphragm-seal-pressure-gauges.html

Flush diaphragm pressure gauge, is composed of all-stainless steel case gauge and diaphragm body. This kind of diaphragm pressure gauge is applicable for oil refineries, chemical plants and many other industrial areas. It particularly applies to a corrosive environment.

For diaphragm 4 inch gauges , we also have sanitary type diaphragm fluid pressure gauge.

Specifications:
Specifications of 4 Inch Flush Diaphragm Seal Pressure Gauges
Dial size:4", 6"
Pressure range:-1- 0- 1000bar
Socket:316SS bottom
Contention thread:NPT, BSP, BSPT and other special specification
Diaphragm:SS316L, Viton, Monel, Hastelloy, Tantalum available
Case:304stainless steel
Bezel:304stainless steel ring
Window (lens):Polycarbonate lens, tempered glass available
Dial plate:Single and dual scale (psi, kpa, mpa, bar, kg/cm²) available
Accuracy:+/- 1.6 % full scale
Liquid Filled medium:Glycerin filled -20 to 60℃