Adjustable apparatuses for improved lockout-tag out safety. The apparatus includes anchor, drive and securing portions that allow the apparatus to sit within a valve casing and block access to a valve. The anchor portion is selectively expandable via the drive portion to grip opposing walls of the casing, thereby holding the lockout apparatus in place. The securing portion provides selective access, such as through a lockable latch, to the drive member. When the securing portion is in a closed state, the drive member is inaccessible and the anchor portion cannot be adjusted. Anchor portions can include scissor jacks or other types of pneumatic or hydraulic devices. The shape and size of the securing portion, such as a six-inch diameter disk or plate, can further allow the lockout apparatus to rest on a top portion of the casing when the anchor portion is in a contracted state.