What are the differences between the SPE-DEX 4790 Extractors, the Spe-Dex 4770, and the Spe-Dex 4750 Extractors?
1) Water Bottle Holder: Unlike the 4770 & 4750 Extractors in which the sample bottle sat loosely in the bottle holder, the 4790 requires a tight seal between the bottle holder and the sample bottle cap adapter. This is required, as the Water Inlet Valve now remains open during the entire water sample. In comparison, the 4770 & 4750 Water Inlet Valves opened and closed to introduce the water sample.
