Product review (5 stars): BAD NEWS for THIEVES & VANDALS
Terrific Product!!!  We live in the Inner-City and are Black.  Some neighbors put water down our oil fill pipe - cost the Landlord $$$thousands$$$ to pump out the tank, fix the furnace, not to mention we had no heat.  This little device foiled the bigots from trying to run us out.  The Landlord installed this cap on the oil fill pipe and we put OUR padlock on it - we've been warm ever since.