Non-metal safety mechanism used in securing covers of stackable riser assemblies used in conjunction with on-site septic waste and underground drainage systems; plastic device for limiting access to securement screws for covers of stackable riser assemblies

'access':31 'assembl':13,40 'conjunct':16 'cover':9,36 'devic':28 'drainag':25 'limit':30 'mechan':5 'metal':3 'non':2 'non-met':1 'on-sit':18 'plastic':27 'riser':12,39 'safeti':4 'screw':34 'secur':8,33 'septic':21 'site':20 'stackabl':11,38 'system':26 'underground':24 'use':6,14 'wast':22

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