Get the original Extendable Level from Plumb-It. Developed in 1984, these levels have become the builder's standard. Available in 5 sizes and extending up to 21.8 feet, these levels will save you time & money every day you use them. Replacement parts are available for all Plumb-It Levels. Listed here are parts, prices and ordering information. Parts Available for all extendable levels, these padded soft cases will provide protection when it's not in use. Soft cases come with a Velcro end closure and sturdy carrying handle. Click You can easily build your own hard storage case for extendable levels by following the plans provided here.