Abstract: A desirable seal structure for use in forming a seal around the exterior of a pipe or the like can be constructed so as to use a retainer member, a compression member, a sealing member located generally within the retainer member and generally between the compression and retainer members and bolts for compressing the retainer and compression members against the sealing member. The compression and retainer members are provided with beveled surfaces which are complementary to corresponding tapered surfaces on the sealing member. The sealing member is shaped so that it will move inwardly when compressed between the compression and retainer members.

Abstract: An improved roof drain cover useful in minimizing the changes of comparatively large amounts of water backing up around the drain can be constructed so as to include primary and secondary rims serving as weirs located on a flange which extends around a centrally positioned grate. The primary rim is formed at the periphery of the flange and integrally therewith, while the secondary rim is formed adjacent the junction of the flange and grate and forms a channel with the grate. Notches are provided in these rims so as to permit water flow through them. The dimensioned rims are so that, as such inorganic particles accumulate against them, lighter organic material such as leaves will be carried by draining water over the rims and up against the grate.

Abstract: A known pipe holder having a split cylindrical body having a plurality of spaced pipe engaging fins located on the interior therof, a plurality of holding structures for engaging the interior of a hole in a support member located on the exterior thereof and flanges for limiting the insertion of said body into such a hole by engaging a surface in the support member, said body being capable of being temporarily opened along the slit therein so that it can be around a pipe can be improved by (1) constructing the holding structures so that each of them comprises a plurality of spaced, radially extending elongated vanes for engaging the interior of an elongated hole, each of the vanes having an edge located remote from the body, each of the vanes also having a barb located on each of the edges; or (2) constructing the holding structures so that each of them comprises a plurality of spaced ratchets located on the exterior of the body at the same distance from the flanges for engaging the surface of a member remote

Abstract: A desirable tub box can be constructed using identical, hollow housing and closure sections having perpherial or edge flanges carrying cooperating male and female structures which secure the sections together in a face to face relationship. Knockout opening areas are provided in the peripheries of the sections so as to provide an opening to accommodate a pipe.

Abstract: The application of stresses which might cause damage to a pipe or tube when the pipe or tube is held by a holder or clam can normally be avoided by using fins on the holder which resiliently engage the pipe and which do not press any sharp edges directly into the periphery of the pipe.