Posted by Harold Kestenholz - Hydronic Network on November 15, 2001 at 14:58:44:
In Reply to: national gas boiler hot h2o sys posted by john cook on November 15, 2001 at 10:55:16:
The seals between radiator sections are tapered pieces of pipe called push nipples that seal by interference as they are squeezed together by the long bolts. They are not usually bothered by sand-blasting unless overdone or almost corroded through.
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