Jarrett Johnson wrote:

George asked -->  " I will use your timely suggestion mate- will household
water pressure do the
 job?"

George You'll find that you need 3psi at a max to get it off. Just ruff math
but if your plug is even 1 ft sqr in surface area [ I'd say its twice or
more in size but we'll use 144 sqr" for ruff #] that means you'll have in
the neighborhood of 432lbs force pushing that part off your mold.. I think
it'll do the trick  :)  I've seen 1500# cement septic tanks lifted off of
their forms w/ only 1-2 psi used to 'break' the vacuum of the mold.. works
like a charm!

Jarrett Johnson

 
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