you should look for the 133392A O-ring assembly or the 4074EYK/EYL kits depending on your specific valve body size

75-inch probe

The Emerson 100RB2P2 is typically rated for an MOPD up to 300 psi

(2) PTFE reinforced washers

Lochinvar & A.O. Smith 100147003 Temperature Gauge you should look for theThe Lochinvar & A. O. Smith 100147003 Temperature Gauge is a critical monitoring component designed for precision thermal tracking in high performance hydronic systems. This 2 1 2 inch dial gauge provides an accurate readout ranging from 50F to 266F (also rated for 0 250F in specific applications), ensuring your boiler or water heater operates within safe thermal parameters. As a direct OEM replacement part, it is 100% identical to the GTP3000,