FAQ · Sourcing, specs, sampling, shipping
Six groups of answers, no please-contact-us.
6 steps · quantities and weeks
01
Send the interface
Target size family or rack standard; one line is enough.
02
Reply in one business day
English quote plus a one-page spec sheet.
03
NDA and drawing review
2D or 3D in; redlines back against the loop diagram.
04
T1 prototype
5 to 10 pcs; 2 to 3 weeks, or 3 to 4 weeks for custom geometry. industry-typical
05
Pilot lot
50 pcs up; 3 to 4 weeks after design freeze. industry-typical
06
Volume
4 to 6 weeks on mature models. industry-typical
A custom part usually takes 2 to 3 prototype rounds. NDA, rounds and ramp: project support.
Revision · colour marking
Q1
The interface is fixed by the OCP UQD specification, Revision 1.0. A plug and socket from different makers, each designed to that specification, share the same envelope, flow and colour-marking requirements. A merged draft revision dated 2025-04-16 exists and is tracked; current designs stay on Revision 1.0 until it is superseded.
Q2
Colour marking is a mandatory item in the specification, not a styling choice. The colour sits on the coupling body so a supply line can be told from a return line without tracing it back. Both colours belong to the standard; neither is a brand colour.
Q3
Interchangeability is a property of the interface. Sealing behaviour and connect force belong to each maker's part, so a mixed pair is verified on the bench before the BOM is frozen. Redundant multi-lobed seal construction is the industry reference pattern; ask each maker which pattern their part uses.
Internal volume · loss per disconnect
Q4
Total internal water volume by size: 1.7 ml (UQD02), 3.2 ml (UQD04), 3.8 ml (UQD06), 5.7 ml (UQD08). At 0 psi the specification caps fluid loss per connect or disconnect at 0.020, 0.025, 0.035 and 0.070 ml in the same size order.
Q5
The coupling is a dry-break part: the socket closes on disconnect, so what escapes is bounded by the values in the answer above, measured per connect or disconnect. Those values are stated at 0 psi. In a maintenance window, depressurise the branch you are breaking before you swap.
Q6
Four sizes: UQD02 (1/8 in), UQD04 (1/4 in), UQD06 (3/8 in) and UQD08 (1/2 in). Internal volume rises with size, from 1.7 ml to 5.7 ml. If the size is not decided yet, send the flow rate and the tube size and the reply carries the sizing.
Two couplings, two marked rings. Which line a ring marks is set by the specification.
4 classes · volume · both ends
Both scale references are renderings. Sizing derivation: the choosing-a-size note.
Multi-lobed · service count
Q7
Process documentation is maintained to an ISO 9001-aligned process. Every lot is serialised, so a part in the field traces back to its build record. The test data that ships is the data for the acceptance band you specify, so name the band in the RFQ instead of asking for a pass or fail.
Q8
Redundant multi-lobed seal construction is the industry reference pattern, and dual EPDM is the matching material benchmark for this interface. Ask for the seal construction drawing with the quote, and check the seal material against the fluid you actually run.
Q9
Replacement follows connect and disconnect count, not the calendar. Every service swap costs one cycle and the small fluid volume listed above, 0.020 to 0.070 ml at 0 psi. Log the swaps per position and the seal budget follows the log.
Cross-section of the seal seat, drawn to no scale.
Prototype · pilot · volume
Q10
Prototype quantities start at 5 to 10 pieces. Pilot lots start at 50 pieces. Those are industry-typical published values, and the quote is written against your drawing rather than against a catalogue line.
Q11
T1 samples: 2 to 3 weeks standard, 3 to 4 weeks for custom geometry. Pilot lot: 3 to 4 weeks after design freeze. Volume: 4 to 6 weeks on mature models. A custom development typically runs 2 to 3 prototype rounds.
Q12
First-article documentation is issued with the T1 lot. On a custom part the 2 to 3 prototype rounds are documented as they happen, so the FAI is a record of the development rather than a formality at the end. State the FAI format you need in the RFQ.
Valved · valveless · two chapters
Q13
Valved couplers classify under HTSUS 8481.80.3090. That comes from US CBP ruling NY N071713, which placed a quick coupler with a hand-operated valve in heading 8481.80. The ruling reference is shared with the quote on request.
Q14
Without valve mechanisms the part has been classified as an iron or steel pipe fitting: 7307.92.3010, from US CBP ruling NY K81592. The two rulings sit in different chapters, so the duty treatment and the paperwork differ. The right code follows the configuration you actually buy.
No waybill or barcode in the frame — a rendering, not a photograph of a parcel.
China-side practice · samples · manifolds
Q15
China export practice for valved couplers runs under 8481.80, commonly declared as 84818090. Confirm it per shipment against the actual configuration, because the code follows the valve, not the product family name.
Q16
Samples are classified by the same split as production: valved parts one way, valveless parts the other. Give the destination country in the RFQ and the classification is settled before the box is packed, so nothing is decided at the counter.
Q17
No published ruling separates manifolds from the pipe-fitting and valve headings, so this one is decided case by case. Send the configuration and the destination, and the classification is documented with the shipment instead of guessed in advance.
When classification is settled, and what travels with the goods: contact page.
Fluid chemistry · storage
Q18
Fluid chemistry drives seal choice, so name the loop fluid in the RFQ. The compatibility baseline for this interface is a PG25-class inhibited glycol. Two volumes matter here: the fluid the part holds, 1.7 ml at UQD02 to 5.7 ml at UQD08, and the volume lost per disconnect, 0.020 to 0.070 ml.
Q19
Spares are stored sealed with the dust plugs in place, and stock is lot-dated so the oldest part goes out first. Internal volume is small, 1.7 to 5.7 ml, so the fluid-side question is cleanliness rather than volume. Cycle count, not shelf time, is what retires a coupling.
The fluid side in full: coolant compatibility and leak testing.
Spec sheet · classification · sample plan
Send the one that is left, with the interface it applies to.
Request spec sheet One business day · English quote + a one-page spec sheet
Spec sheet request
Tell us the interface or the rack standard. Three fields is all we need to size a reply.
One business day · English quote + a one-page spec sheet
Covers UQD02–08 and UQDB03–06 · designed to the OCP UQD / UQDB specification
