The Monument MON1378 is a 100mm Drain Testing Plug, designed for medium-sized drainage pipes typically found in commercial properties, multi-unit residential buildings, and larger domestic installations. This versatile size bridges the gap between smaller household drains and larger commercial systems, making it a valuable addition to any professional plumber's toolkit. This 100mm plug is capable of sealing against pressures of up to 1.97 bar (29 psi), providing confident pressure testing capabilities for drainage systems. The durable flexible construction features removable top caps and rubber rings, whilst the simple wing nut mechanism depresses the rubber cone to create an expanding, watertight seal. Features and Benefits:100mm diameter ideal for medium commercial and larger domestic drainage pipesPressure rating of 1.97 bar / 29 psi ensures reliable testing performanceEasy wing nut operation for quick installation without additional toolsExpanding rubber cone adapts to