Installation instructions - no-caulk refers to the drain connectionYou will need silicone sealant. Yeah... caulk.
Use it to seal between to top of the shower base and the bottom of the drain.
Use silicone only. I wouldn't try this with plumber's putty, especially when plastics/PVC/acrylic are involved.
Keep that fiber /cardboard gasket - it helps the nut slip on the rubber seal instead of bunching it up.
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by shadetree