Dual-check valve backflow preventer assemblies are difficult for plumbers to remove, test, or replace because they _____.
a. have left-hand threaded connections
b. do not have replaceable valve inserts
c. are installed in very tight spaces
d. are not normally fitted with shutoff valves or test cocks
d. are not normally fitted with shutoff valves or test cocks
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Fill in the blank(s) with the appropriate word(s).
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