Thank you for your question, Paula151! DST stands for Diamond Seal Technology, which includes a diamond coated ceramic cartridge and PEX waterways. For more information about DST, please click the link below.
WE stands for Water-Efficient. The model 340-WE-DST has a flow rate of 1.5 GPM and the model 340-DST runs at 1.8 GPM.
Best regards, Jon
Date published: 2018-04-30