These are the required installation kits for Thetford EasyFit / Nano / Compass Premium Plus Toilets (Not Eco Models)
Your selection will depend upon your vessel's voltage, whether you choose to flush with fresh or raw (salt) water and - should you select raw water flush - whether you already have a pressurized raw water system onboard.
NOTE that, unlike the Eco toilets, the Premium Plus toilets already include the control panel switch and wiring harness.
Raw Water Flushing -
In applications where conserving fresh water is important, you can flush with raw (salt) water.
In this case, you should purchase one of the Raw Water Flush Installation Kits.
Most purchasers will require the kit which includes a 12 or 24 volt pump to pressurize the raw water, as these toilets don't have any suction capability for the flush water supply.
Raw Water Flush Pump Kits include a pump to pressurize the raw/salt flush water, and a hose fitting to connect flush water to the toilet. Select the appropriate voltage.
If you already happen to have pressurized raw water onboard, select the Raw Water Flush Kit without a pump. This kit includes only a hose fitting to connect flush water to the toilet. Just a plumbing fitting, there is no voltage associated with this kit. At this time, this kit (#38861) is only available by special order.