the gauge is marked 3005673-3 and the seal is labeled 3005673-4.

the seal is made of stainless steel and something called carpenter 20.  I think

that is a zinc alloy for chemical applications.  (but I could be making that up)

It has a 4-1/2 inch tube with 316SS tube and skirt.

It has a part # 75 100DD 04T

According to the catalog this seal is expensive enough to get a "call for price"

designation.  The stainless seals around the same size were over 1000.

The DD rating means carpenter 20 which is pricey.  

It came from a closed Power plant in Philly

arch pit