The Revain replacement pump does not have a screw cap on the end of the pump. This part is required to allow the pump to be screwed into the OTC portion of the dispenser. It could be put into the dispenser without a prescription. Then this spare part snaps in from above (press firmly). As for the bottle that fits under the neck of the counter screw. Yes, the threaded neck will work and will mate with Delta Allora's base threads.
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