OATEY 33956 1-1/4" Suspension Pipe Clamp (25 in polybag)

The Oatey 33956 is sized for 1-1/4 inch pipe. It is a single-size clamp, so runs mixing 1/2, 3/4, or 1 inch lines need the matching clamp for each size rather than this one.

Yes. The 33956 is rated for use on hydronic systems, and the ribbed body lets the pipe move as it heats and cools instead of binding against the clamp. That expansion and contraction allowance is the reason a ribbed polypropylene clamp is used on hot water lines rather than a tight-fitting solid strap.

No. The 33956 clamp body is polypropylene plastic, so it will not rust or corrode the way a steel strap does in damp crawlspaces, slab areas, or near condensate. It also avoids the galvanic issue you get hanging copper in contact with dissimilar metal.

It comes 25 clamps to a polybag, which is how a plumber or MRO stockroom usually buys them for a repetitive overhead run. Each clamp weighs 0.031 (about an ounce), so a full bag is light to carry up a ladder.

A suspension clamp like the Oatey 33956 hangs pipe off a hanger rod or overhead support so the line runs free below the structure. A two-hole strap pins the pipe tight against a joist or wall and does not allow movement. For overhead hydronic or hot water runs where the pipe grows and shrinks, the suspension clamp is the one you want; for fixing a stub to a stud, use the strap.