Mr Dudley, I should apologize. You asked the simple question of where could you get 2 1/2 " cartridges and I responded with all sorts of pressure and measurements and all sorts of stuff that you had not asked. The simple and direct answer needed only one word, RST, and that was what I should have said and let it go at that. Your question struck an interest of mine and I ran off with it.
Bruce Day
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