The thing about plastic is its a little harder for sonar to pick up, cause I've got many a way points marked for me to enjoy from someone else's blood, sweat and tears, not saying I don't sink hard wood, but I usually expect those piles to eventually become community piles. find you are plumber willing to save you the junk stuff and the cost is nearly nothing, my opinion, I'd rather build these in the yard load them up and go drop them for a life time of enjoyment, rather than a day of dragging brush for us side imaging fools to easily find.....I have acquired 100' of new sch. 40 6" pvc, about a 1000' of 2" poly all free of charge.....