Midwest Control SGHP-100RF Sight Glass with Built in Reflector, 1" MPT, Nickel Plated Steel, 1250 psi, 1.38" x 1.06": Amazon.com: Industrial & Scientific
High Pressure Sight Glass, NPT 1 inch Threaded, 316 Stainless, Quartz WIndow
Size 8 Type A, High Pressure 12-5/8" Gauge Glass | APG
5" x 5/8" OD High Pressure Borosilicate Tubing Sight Gauge Glass w/ 2 Gaskets | eBay
Custom-Made Welded Glass Plate High Pressure Sight Glass Level Gauge for Liquid Tank - China Stainless Steel Water Level Gauge, Water Tank Level Indicator Gauge | Made-in-China.com
High Pressure Sight Glass | Tri Clamp 1.5 in. - SS304 / FKM / PTFE
KSR Kuebler Sight Glass Level Indicator
High Pressure Sight Glass | Tri Clamp 2 in. - SS304 / FKM / PTFE
Sight Glasses, Liquid Level Gauges, Flow Indicators and Process Equipment