BUYER SUPPORT / FIRST ORDER
Compare factory quotes on the same rubber coupling line
FREE specification and sourcing-requirements review
Eligible first orders may receive up to 3%
Eligibility applies to qualified business buyers and is confirmed after we review your product, quantity, destination, and sourcing requirements.
Use this page to set sample, approval and acceptance language for plumbing rubber coupling. It is not an energy-savings calculator and it does not publish a discount.
Fill the left column on the sample. The right column is what a later batch must match. Empty cells remain buyer decisions.
| Field | On the approved sample | On the later lot |
|---|---|---|
| Inner / outer diameter or nominal size | Measured value and unit | Same unit; factory reports the lot value |
| Thread or socket type | As confirmed on the sample tag | Same end type, or a written change |
| Material grade | Declaration that arrived with the sample | Same grade name; no silent substitute |
| Quantity unit | How the sample was counted | Pieces, sets or kits for the destination |
| Destination packing | How the sample was packed | Agreed carton, bag or pallet mark |
| Hardness check, if used | Shore A reading and the face that was measured | Same Shore A scale; do not mix Shore D into the file |
| Compression set, if requested | ASTM D395 condition written on the sample note | Same method and temperature; a plant brochure is not the lot result |
A sleeve labelled only “plumbing rubber coupling” cannot be approved. Measure ID/OD, photograph the tag and send the values back before a lot is compared.
If the production lot changes band material or shield, treat it as a new request. Compression set or Shore A talk is useless if the construction changed.
A unit price on loose pieces is not the same deal as a palletized kit. Lock the quantity unit and destination packing as acceptance conditions.
The writing order is in the request checklist.