Related Clues:

• Kick in
• Word on a dipstick
• Use a calculator
• Blueprint extra
• Do arithmetic
• Conduit fitting, perhaps
• Airplane part
• Put into the mix
• Plumber's connection
• Put in with the rest
• Say more
• Pipe angle
• Pipe with a quarter bend
• Put 2 and 2 together
• Lengthen (with "to")