PresSure Products Company (PPC) is a pioneer in the safety sight glass industry, producing a complete line of sight glasses, liquid level gauges, sight flow indicators, process lights, reactors/chambers, ultrasonic stencil cleaners, and concentration monitoring systems. PPC designs, manufactures, and sells our products to industrial, government, and research customers all over the world, with our principal product line revolving around pressure-bearing sight glass windows. PPC is THE premier full-range sight glass manufacturer: Our products range from low-cost cast models for easy applications, to high-end units capable of tolerating both high-temperature and high-pressure conditions, and also include custom sight glass windows and associated reactors.