Description
The Swiss-made clamp that contractors trust on the irrigation manifolds they can’t come back to. Oetiker’s 1-Ear Stainless Stepless clamp closes in a single pincer stroke, locks shut with a mechanical interlock instead of a spot weld, and stays sealed at full pressure year after year — even on poly pipe sitting in wet soil. The 1″ size (part 15500220, Ref. 331) is designed to clamp over a 1″ poly-pipe-on-barb connection, with a closing range of 30.0–32.2 mm (1.181–1.268 in) to handle the OD spread you get from real-world pipe and barb tolerance.
Why Pros Pick Oetiker Over the Cheap Worm-Drive
- Mechanical interlock closure — no spot weld, no corroded fail point, no surprise gap opening up in year three
- Stainless steel band (1.4301 / UNS S30400) — ≥ 1000 hours salt-spray corrosion resistance (DIN EN ISO 9227), built to live underground or in wet valve boxes
- Single-stroke tool closure — one squeeze on the pincer and you’re done, no secondary crimping
- Visible ear deformation — you can SEE that the clamp closed correctly, no guesswork
- Raised dimple in the band — increases radial clamping force without extra band thickness
- Burr-free band edges — won’t cut into soft poly pipe over time
- ToolFit Technology — the ear ships pre-crimped at the factory so the pincer seats squarely and doesn’t slip during the squeeze
- Made in USA
Why ToolFit Matters
On a standard 1-ear clamp, the ear has roughly a 5.6° angle when you reach for it — that’s tight, and the pincer jaws can slip off-center if you’re working in a trench at an awkward angle. The ToolFit ear is pre-crimped to 18° at the factory, giving the pincer a wider, deeper seat. The result: fewer botched crimps, fewer comebacks, faster install on long runs.
Where It Shines
- Drip and emitter line connections on 1″ poly distribution mains
- Service-call replacements on failed worm-drive or import ear clamps
- Low-voltage / outdoor environments where a stainless band outlasts a zinc or plated steel clamp by 5+ years
- Any irrigation install in the rust belt or coastal zones where corrosion is the #1 callback cause
Specifications
- Manufacturer part: 15500220
- Oetiker Reference: 331
- Series: PG 155 (Stainless Steel)
- Band material: Stainless Steel 1.4301 / UNS S30400
- Tube size designation: 1 in nominal
- Closing diameter range: 30.0 mm to 32.2 mm (1.181 in to 1.268 in)
- Band width: 7.0 mm (0.276 in)
- Band thickness: 0.6 / 0.8 mm
- Ear width inside: 10 mm
- Closure: Mechanical interlock (not spot-welded)
- Ear style: ToolFit pre-crimped (18° factory crimp angle)
- Closing force (max): 2000 N
- Corrosion resistance: ≥ 1000 hours (DIN EN ISO 9227, salt spray)
- Reusable: No — cut off and replace after removal
- Origin: Made in USA
- Approximate weight: Listed at 1 lb pack (per Garoppo’s pricing unit)
Compatible Closing Tools
- Manual: Oetiker HMK 01 or S01 pincers
- Pneumatic: Oetiker HO ME 2000
- Cordless: Oetiker CP 01
Important: Close in a single tool stroke. Do not crimp twice. The mechanical interlock seats during the first squeeze; a second pass can damage the clamp and weaken the seal. If you mis-position, cut the clamp off and use a fresh one.
Install Notes
- Slide the open clamp over the hose BEFORE pushing the hose onto the barb — you can’t open it back up once it’s sitting on the fitting
- Push the hose fully home onto the barb — until it bottoms out
- Position the clamp directly over the barb’s clamping band (the smooth section between the barbs)
- Squeeze the pincer once with steady force until the ear closes flush — the band will deform visibly into the interlock
- Pressure-test the connection before backfilling the trench
Stop by Garoppo’s for the count you need, or order ahead for the next install.