Sterling Radiator Traps will operate efficiently regardless of steam pressure variation. All thermostats and seats are replaceable without shimming or adjustment. Every trap is thoroughly tested. Components are inspected and tested during manufacture; completed traps undergo complete operating tests before shipment. Trap bodies, covers, union nuts and nipples are close grained red brass castings. Accurate machining assures steam-tight fit and complete interchangeability of parts. Sterlco® low pressure traps, except 715-A, have valve cones of long-wearing tobin bronze and seats of brass. All others have stainless steel cones and seats for maximum resistance to high temperatures and abrasion. Stainless steel cones and seats are available for 1/2" and 3/4" LP traps. Note: Above ratings are in accordance with the standards of the Steam Heating Equipment Manufacturers Association. Since actual test capacities are from two to four times these ratings, traps may be selected directly from the table for the lowest pressure differential expected. *Available with tail pieces to reduce or increase "A" dimension by 3/8 inch.