Kani suisen shiki benjo (lavatory having both functions of flushing with water and scooping up the waste) or tonneru shiki benjo (tunnel type lavatory) are the intermediate types between them, and the latter is a suisen shiki benjo but can be included in the category of a rakka shiki benjo (botton benjo) and the former is a vault toilet but can be included in a suisen shiki benjo.
簡易水洗式便所やトンネル式便所はこの中間型で、トンネル式便所は水洗式便所ではあるが落下式便所（ボットン便所）の範疇に、簡易水洗式便所は汲み取り式便所ではあるが水洗式便所に含めることもできる。