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While the Model 300 has the same body dimensions as the Model 303, the o-ring on the Model 300 is closer to the inside flange. The length is 11.4 mm from the inside flange to the top of the o-ring groove.
Model 300 (AF-300-61-L040)
Straight Plug for Standard 25 mm Port
Standard straight port for standard 25 mm port. O‑Ring distance from the flange is 0.43″ (11 mm).
| Part Number | Size and Material | Compatible Ports |
| Model 300 (AF-300-61-L040) | 25 mm Straight Threaded Plug316L Stainless SteelSilicone O-ring | Model 100 |