The 666 RTTS reduced port valve has a size range of 1/2″ – 2″, reduced port. It is a two piece entry with FNPT ends. Temperature range / WSP is -40°F to 366°F / 150 psi steam. The seats are PTFE and the stem packing / seats are adjustable PTFE / Buna-N O-ring. It is a manual lever, non-locking operator.