Ok I saw there is not 1 but 2 sizes of drain plugs. Now I ask WHY? I ask because a decade or so it appeared to only be one size. Is this for any specific reason like model variants or due to skid protection? Just curiousI as it seems odd. Does it mean you have to put a plug in from the inside and then another from the outside? I feel stupid here as this question just flat out seems stupid to even have to be asking.