Strength of different designs of PVC cleanout plugs?
Are there are any significant differences in strength between different PVC cleanout plugs, in terms of PVC material and design. Assume the same size, that is compare 3" PVC plug to another 3" PVC plug, or 4" PVC plug to another 4" PVC plug, or 6" PVC plug to another 6" PVC plug.
I assume all have the marking PWV because I assume PVC pressure pipes do not use them. But still there could be differences in PVC construction between different manufacturers. Also another strength factor is the design for the wrench, that is slotted design, raised square head design, and sunk square design.
I am trying to figure out which cleanout plug will last the longest during frequent use by opening and closing of the plug. I plan to use a special wrench designed for each design. My preference is the slotted design. This is for easy access to the plug on a short pipe segment up to 3 feet, sort of a storage cache.