OATEY 33901 3/4 in Half Clamp Pipe Clamps With Nails (100 in polybag)

Nails come with them. Each clamp ships with a rust resistant nail, so the only thing you bring to the job is a hammer. The bag holds 100 clamps with nails.

Yes, Oatey rates the 33901 half clamp for use on hydronic systems, so it can be used to secure heating loops as well as potable water lines. The body is high impact polypropylene, which is non corrosive and won't react with copper the way a dissimilar metal strap can.

The 33901 has a ribbed interior that insulates the pipe against water line noise, which is the main reason plumbers pick it over a bare metal strap in finished residential walls. It isolates the pipe from the framing so expansion movement doesn't transmit as ticking. It won't cure true water hammer from fast-closing valves, that's an arrestor's job.

A half clamp like the Oatey 33901 is the faster choice when the pipe is already run and sitting against a stud or joist face, since you set it over the pipe and drive the single nail. A full clamp has to be slipped over the pipe end or closed around it, which matters on stacked runs or where the pipe is suspended away from framing. For a standard 3/4 inch domestic water line stapled along studs, the half clamp is the normal pick.

One hundred clamps come in the polybag, each with its nail. At the usual spacing for 3/4 inch copper or PEX on studs and joists, a bag covers a typical single family rough-in with spares, which is why supply houses stock it as the standard contractor pack rather than a small count card.

The clamp body is non corrosive polypropylene and the supplied nails are rust resistant, so damp crawlspace and basement service is within what the 33901 is built for. There is no steel strap to bleed rust onto a finished surface below.