WIKA® FlexWindow™ Liquid-Filled Gauges
• 100% glycerin liquid fill—no expansion bubble to impede your view
• Shatter-, scratch- and puncture-resistant liquid silicone rubber (LSR) window
• Exceptional chemical resistance
• Convex LSR material provides a beneficial magnifying effect!
WIKA’s FlexWindow is an innovative alternative to liquid-filled gauges with a traditional polycarbonate window and vent plug. The optically clear LSR window expands or contracts to compensate for temperature-related overpressure or negative pressure. Because the window flexes, the gauge can be liquid-filled to 100%, so there’s no bubble to impede your view!
LSR won’t yellow over time, tolerates high temperatures, and resists shattering, scratches and punctures. It’s much more resistant to chemicals than polycarbonate or PMMA plastic. Additionally, the convex window shape provides a magnifying effect, making the dial even easier to read.

2-1/2'' Corrosion-Resistant Gauges with FlexWindow
2-1/2" Corrosion-Resistant Gauges with FlexWindow
• Welded case-to-socket connection keeps out debris, fluid and moisture
Accuracy:±2/1/2%
Wetted materials:316 stainless steel
Case material:304 stainless steel; silicone rubber FlexWindow
Process connection:1/4" NPT(M), lower mount
Dial size:2-1/2"
Pointer:aluminum
Fluid fill:glycerin
Click on stock #s to see pricing.
RANGEGRADSSTOCK #
30" to 0" Hg VAC0.553571
30" Hg to 30 psi0.2/0.153572
30" Hg to 60 psi0.5/0.253573
30" Hg to 160 psi0.1/0.553574
0 to 15 psi0.553575
0 to 30 psi0.553576
0 to 60 psi153577
0 to 100 psi253578
0 to 160 psi553579
0 to 200 psi553580
0 to 300 psi553581
Product Questions?
2-1/2'' Low-Lead Brass Liquid-Filled Pressure Gauges with FlexWindow
2-1/2" Low-Lead Brass Liquid-Filled Pressure Gauges with FlexWindow
• Comply with the 2014 U.S. Safe Drinking Water Act and NSF 61/372
Accuracy:±2/1/2%
Wetted materials:lead-free copper alloy
Case material:304 stainless steel; silicone rubber FlexWindow
Process connection:1/4" NPT(M), lower mount
Dial size:2-1/2"
Pointer:aluminum
Fluid fill:glycerin
Click on stock #s to see pricing.
RANGEGRADSSTOCK #
30" to 0" Hg VAC0.553582
30" Hg to 30 psi2/153583
30" Hg to 100 psi5/253584
30" Hg to 160 psi10/553585
0 to 15 psi253586
0 to 30 psi253587
0 to 60 psi253588
0 to 100 psi253589
0 to 160 psi553590
0 to 200 psi553591
0 to 300 psi553592
Product Questions?