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Hi Angus et alia, Great question and great responses. The major criteria are the cost and the sustainability. In Guatemala, pressure relief valves need to be imported. Even a pressure relief box needs a float valve, similar to the ones we use in toilets in the US. These valves are typically available even in rural areas. We have preferred boxes to pressure reduction valve for a number of reasons. We even have plans for them. Cost also depends on the availability of local materials to build the box. We build the boxes out of stone masonry, cement, limestone, and rock; very labor-intensive. I have yet to see a plastic pressure relief box. I plan to talk to a local entrepreneur to see the possibilities. Keep up the great work... Bruce