I've not had a Dometic 300 but it seems the go to brand/model is the Dometic 310 or 320. The 310 is the round bowl and the 320 is elongated. Another notable difference is that the 310 is "rimless" and the flush ports are located along the upper flat rim of the bowl. The 320 has the rinsing ports underneat the upper "rim" like a regular S&B toilet. I always put in a 310 right off the bat.
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Danny and Susan, wife of 56 years
2019 Ram 3500 Laramie CC SWB SB 6.4 4x4 4.10
2020 Montana High Country 331RL
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