Yes I have a squasher bought at Drainage centre for about £15. It consists of two u bolts two steel bars about 1" diameter and a garrott. imagine two bars squashing a pipe. Go until water squeels don't go much further i.e. don't necessarily go for total shut off just shut down to workable amount of water. Then mark the pipe where you squashed it so next time you will squash it a little away from that point. Can also squash Alcathene but it is more prone to fracture and most definately can only be squashed once in one place.
On the whole it is a procedure of last resort but I haven't had any problems doing it.
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