SPECIAL ORDER ITEM. Review Returns Policy before purchase. Carbon steel cold press systems are designed for use in chilled water, hydronic heating, compressed air, fire sprinkler, fuel gas and heating oil applications. Suitable for use in piping systems utilizing schedule 5 to schedule 40 black steel pipe, these fittings are equipped with a factory installed HNBR sealing element, a 304 stainless steel separator ring and a 420 stainless steel grip ring. The streamlined design allows for quick and easy installation without the need for threading or welding. Patented smart connect technology helps installers easily identify unpressed connections during pressure testing, ensuring a reliable joint.