DY-2 Brass 90° Elbow Fitting – Precision Threaded 1/4"x40 TPI for Live Steam Projects. Precision Threading: Standard 1/4" x 40 TPI for a secure, leak-free seal. Thread Size: 1/4" x 40 TPI. Upgrade your live steam engine or model boiler system with theDY-2 Brass 90-Degree Elbow Fitting —a high-performance, compact connector engineered for durability and leak-proof operation.