Abstract: A generally cylindrical base (104) has an upper cylindrical recess (106), a lower cylindrical recess (108) with a diameter less than the diameter of the base to form an annular bearing surface (110), and J-shaped locking notches (112). An elastomeric sealing member (122) is positioned within the upper recess in sealing contact with the bearing surface. A pin (144) extends through the sealing member with end ears (150) positionable in the J-shaped locking notches for locking and sealing.

Abstract: A locking stopper component has lower, upper and central extents. The lower extent includes a stick. A frusto-conical cam shoulder is formed in a central extent of the stick. The upper extent includes a lock rotatable between locked and unlocked positions and an upper shaft. The central extent operatively coupling the upper and lower extents includes a reciprocating assembly and a rotatable assembly whereby rotating the lock rotates the rotatable assembly and raises the reciprocating assembly to secure the component in a tubular member.

Abstract: A stopper component has upper and lower ends. The stopper component is removably positioned in a cylindrical opening. A shaft/dipstick is positioned within the stopper component. The shaft/dipstick has an upper end adjacent to the upper end of the stopper component. The shaft/dipstick has a lower end. The lower end extends beneath the lower end of the stopper component. A lock has an interior end coupled to the upper end of the shaft/dipstick. In this manner positioning the lock in a first orientation will lock the stopper component in a cylindrical opening. Also in this manner positioning the lock in a second orientation will unlock the stopper component to facilitate removal of the stopper component from a cylindrical opening.

Abstract: Holes can be cut squarely through obstructions hidden within a hollow wall by apparatus that may include a flexible guide tube having a work-engaging head at one end; a collared lead screw or other arrangement for bringing the work-engaging head into perpendicular engagement with an obstruction; and a cutting tool for cutting the hole. In a some versions of the invention, two work engaging heads are coaxially attached to the end of the guide tube, inserted into the wall through an access hole, and used to sequentially cut holes through two obstructions. An advantage of this arrangement is that the second, smaller, hole has a large enough diameter to be used for feeding most sorts of flexible lines through the wall. In addition, a panel protecting apparatus is provided so that extensive work can be done within the wall without damaging the margins of the access hole.