The piping would lead down into your sump from the overflow box.
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	2:det	_
2	piping	piping	NOUN	NN	Number=Sing	4	nsubj	4:nsubj	_
3	would	would	AUX	MD	VerbForm=Fin	4	aux	4:aux	_
4	lead	lead	VERB	VB	VerbForm=Inf	0	root	0:root	_
5	down	down	ADV	RB	_	4	advmod	4:advmod	_
6	into	into	ADP	IN	_	8	case	8:case	_
7	your	your	PRON	PRP$	Case=Gen|Person=2|Poss=Yes|PronType=Prs	8	nmod:poss	8:nmod:poss	_
8	sump	sump	NOUN	NN	Number=Sing	5	obl	5:obl:into	_
9	from	from	ADP	IN	_	12	case	12:case	_
10	the	the	DET	DT	Definite=Def|PronType=Art	12	det	12:det	_
11	overflow	overflow	NOUN	NN	Number=Sing	12	compound	12:compound	_
12	box	box	NOUN	NN	Number=Sing	4	obl	4:obl:from	SpaceAfter=No
13	.	.	PUNCT	.	_	4	punct	4:punct	_
