DY-2 Brass 90° Elbow Fitting – 1/4"x40 TPI for Live Steam Models. Accurate Fit: Standard1/4" x 40 TPI screw thread for tight, secure connections. Thread Size: 1/4" x 40 TPI. Upgrade your live steam engine or model boiler setup with theDY-2 Brass 90-Degree Elbow Fitting —a compact, precisely threaded pipe connector built for performance, durability, and authenticity.