the rv shops all sell the smaller diameter fittings and hoses. the ones we have on our older rigs are Thetford and are heavier duty and bigger.
i did find one at a camping world last summer, but most shops will not have them.
do a search on Thetford valves and i am sure you will find some online.
you should be able to find them for 10-15 bucks.
tom
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