Comparison : Item # 8550-2T, 1/8" Female Pipe Thread Size Air Cocks Polished Brass - Female Pipe To Female Pipe - Tee Handle - Hex Shoulder
Item # 8560-4T, 1/4" Female Pipe Thread Size Air Cocks Polished Brass - Female Pipe To Female Pipe - Tee Handle - Hex Shoulder
Item # 8570-6T, 3/8" Female Pipe Thread Size Air Cocks Polished Brass - Female Pipe To Female Pipe - Tee Handle - Hex Shoulder