RX-type ring-joint gaskets are used for high-pressure applications in the Oil & Gas, oil field drilling, and petrochemicals industries. RX-Type gaskets have slightly increased height and leverage the internal system pressure to energize and improve the seal as internal pressure increases. Carbon steel, 304 and, 316 stainless steel are the most commonly used materials. Below listed pipe sizes & ring numbers and pressure classes are for API 6B Series Flanges only.