Raypak 185/R185A/R185B Drain Plug (006721F) nutsboltsscrews A part like this is

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Raypak 185/R185A/R185B Drain Plug (006721F) nutsboltsscrews A part like this isThe Raypak drain plug is designed for compatible 185, R185A, and R185B heater applications where the supported drain point closure component needs replacement. A drain plug is useful because it helps maintain a dependable seal at the drainage point while still allowing the system to be opened when service or draining is needed. This replacement is especially useful when the original plug is stripped, cracked, corroded, or no longer sealing properly.