Related Clues:

• Construction extra
• Pipe fitting
• Home expansion
• Cryptic character
• Blueprint extra
• Conduit fitting, perhaps
• Plumber's connection
• Alpha or omega
• Pipe angle
• Pipe with a quarter bend
• Alphabetic symbol of yore
• Architect's extension
• Plumber's bend
• Right-angle bend
• Alphabetic symbol, of yore