The collars clamp securely onto pipes and hoses with stainless-steel socket cap screws. They have one or two flat surfaces for mounting on another flat surface, or to stack on top of one another. The collars have a smooth bore and come in sizes ranging from 3/8 to 1-in. ID. PTFE or nylon bushings permit pipe expansion and allow for vibration. Aluminum, steel, and special hinged versions are available.
Stafford Mfg. Corp., Box 277, N. Reading, MA 01864, (800) 695-5551, staffordmfg.com