B-Line Eaton series CPVC hangers and restraints, Pre-galvanized, Steel, 72 max spacing, Two-hole stand-off CPVC pipe straps

The B3184-1 is sized for 1 inch CPVC, which has an outside diameter of 1.315 inches, matching the strap's stated 1.315 in width dimension. CPVC straps are sized to the pipe OD rather than to steel pipe clamps, so do not substitute a 1 inch steel pipe clamp here.

Maximum hanger spacing for the B3184 stand-off strap is 72 inches. That is the ceiling, not a target. On horizontal CPVC runs, sagging between supports is the usual failure, so tighten the spacing where the run carries heat or crosses long unsupported spans.

A stand-off strap holds the pipe off the mounting surface instead of clamping it flat against it. That clearance matters on CPVC, which expands and contracts with temperature and is easy to bind or abrade if it is pinched tight to a stud or wall. The B3184-1 is a two-hole stand-off type, so it fastens with two screws and gives a fixed, repeatable offset along the run.

The finish is pre-galvanized steel, which is a mill coating intended for dry interior and normally protected locations. It is not a hot-dip or stainless finish, so for exterior exposure, wash-down areas, or corrosive environments, specify a hot-dip galvanized or stainless support instead.

Overall the strap measures 4.5 in, 2.56 in, and 1.315 in across its height, length/depth, and width dimensions. Use the 2.56 in depth figure when you are checking that the pipe will clear a stud face, furring, or insulation behind it, and allow for the strap footprint when you lay out two screw holes on the member.

Fasteners are not part of the strap. The B3184-1 is a two-hole design, so you supply two fasteners per strap suited to the substrate: wood screws into studs or joists, self-drilling screws into light-gauge steel framing, or anchors into concrete and masonry. Order those separately when you count straps for the job.