Positioning device for tubes to be embedded in surrounding cast material

A device for firmly supporting a length of tube in predetermined spaced relationship from a surface, which comprises a hollow normally vertical cylindrical body the upper end of which is arcuately shaped to provide a bed for a tube, and the lower end of which is shaped to provide members adapted to support said device on a surface and channels adapted to permit cement to flow into and fill the interior of said body when flowed thereon;

• circumferential, uniformly spaced guide scoring on said support members adapted to guide cuts to shorten said members by a predetermined amount;
• a center apertured lug on each of said support members spaced from said lower end, said lug being adapted to permit said device to be nailed or bolted to a surface, and openable locking means adapted to secure a length of tubing in said bed, a plurality of fin pairs under said lug, each fin pair extending horizontally from each score in said guide scoring, the fins of said fin pairs being spaced horizontally apart by a distance about equal to the bore of said lug, the spaces thus formed being in vertical register with the bore of said lug;
• said fin pairs being adapted to provide support for said device when said support members are shortened by cuts through said guide scoring.