¹ Fire Box Quality steel plate chamber material is used on gauge Models 485, 494, and 488.
² Mica shields are standard on all transparent models to protect the glass from condensate
which causes leaching of the glass except Model 490 and must be added at extra cost.
³ Expansion loops or stuffing box nipples are used to allow expansion caused by temperature variances.
⁴ Belleville washers are highly recommended at additional cost to reduce thermal effects on clamping
pressures.
⁵ Belleville washers are required at extra cost to reduce thermal effects
⁶ Flange to flange assembly, which includes cranite gaskets, are required at extra cost.
⁷ Stuffing Box Nipples required at extra cost. The Model 498 valve must be ordered with a stuffing box.