time the backflow prevention valve 30 is operated in a year 39 s time significant amounts of calcium deposits and sediment builds up in the test cocks 40 a 40 b 40 c 40 d of a backflow prevention valve this build up prevents the accurate assessment of the backflow prevention valve because as depicted in fig2 a blockage 80 in the test cock 76 will result in a false pressure reading at the low hose 72 prior to the present invention maintenance personnel charged with checking the operation of a backflow prevention valve 30 would manually force a piece of rigid wire down into the test cocks 40 a 40 b 40 c 40 d to break apart any blockage therein once the blockage was pierced typically the line pressure blows out the remaining blockage along with supply water the result is generally a soggy service man and paperwork from the spray of four test cocks on each backflow prevention valve the most preferred embodiment of the present invention comprises a test cock cleanout device 10 comprising a housing 12 and a rod 14 slidably positioned within a bore 100 formed within the housing 12 when a first end 13 of the housing 12 is attached to a test cock 90 see fig6 the cleaning end 92 of the rod 14 is moved back and forth through the test cock 90 as indicated by the arrow in fig6.