DSU50-3.50-50
EPM DSU50-3.50-50 U-Cup Seal DSU5035050 (Pack of 3)
You will find that the STI-6402 keeps going without overheating in warm conditions.
EPM DSU50-3.50-50 U-Cup Seal DSU5035050
A nice touch on the 812-1100-S is the label that lists the serial number clearly.