↔Define what must fit
State nominal size, measured outside and inside diameter, wall thickness, roll length, connection type and quantity. Identify which dimensions are confirmed and which need a supplier drawing. Keep pressure class and intended exposure in the request.
≋Describe the operating water
Record source-water quality, design flow in gpm or m3/h and operating pressure in psi or bar. Ask each proposed supplier to identify its filtration and flushing assumptions rather than inferring them from the tubing name.
▤Compare a complete reply
Request unit price, currency, MOQ, packing basis, sample terms, dispatch lead-time basis and freight exclusions. A different wall thickness or roll length belongs in an alternative offer, with the changed specification clearly marked.
✓Plan approval before bulk buying
Agree the sample identity, connector trial, dimensions to inspect and acceptance responsibility. Third-party inspection or testing needs its own scope and cost confirmation; a sourcing request does not establish that either has occurred.