Polymer PEX Press 45-degree elbows are available in 1½-in. and 2-in. sizes. The elbows feature Viega’s Smart Connect feature, which allows water to flow past an unpressed fitting. PEX Press is the only system on the market molded from Radel-R, a superior plastic material. Viega PEX Press fittings are factory-assembled with attached stainless-steel sleeves with three view holes, which helps installers insert tubing correctly, ensuring proper installation.