An order for “a 22 mm compression nut” can leave important details unanswered. The nominal pipe size does not identify every feature of the nut or the body it must fit. Before buying a loose replacement, build a short record of the existing fitting and ask for an exact compatible component.
This is a replacement-part ordering checklist. It does not explain how to remove a nut, release an olive, dismantle a joint or decide whether damaged pipework can be reused. Leave those repair decisions to the installer.
Shop the materials: one documented nut example
The Embrass Peerless historical catalogue identifies HP compression nut 324176 as nominal 22 mm. A matching product row pairs that reference with EAN 5055967906051. It is a component example, rather than a universal replacement for every fitting carrying the same pipe-size description.
Buy it now: view the HP 22 mm compression nut. Confirm the actual supplied reference, compatible fitting and quantity before ordering. The maker's nominal row is on printed page 41 of the September 2024 product guide; the exact trade catalogue row provides the reference/EAN cross-check. Neither establishes your existing fitting's compatibility.
Identify the fitting body, not only the pipe
Start with any accessible brand, model or ordering reference on the complete fitting, its paperwork or an earlier invoice. Record whether the component belongs to a valve, straight coupling, elbow or another assembly. A loose nut's label is more useful when paired with the body reference it is intended to meet.
Tell the merchant if the original part is unknown. An honest “unidentified valve body” is better than assigning a familiar brand from appearance. Photographs can help identify candidates, but a similar hexagon or finish does not establish that the threads and internal bearing surfaces are compatible.
Keep nominal pipe size separate from nut details
Record the pipe's specification and nominal size as one line of the enquiry. Put the required nut reference or manufacturer's compatibility information on another line. The pipe-size designation does not itself establish the nut thread's diameter, pitch or form.
Ask the installer or manufacturer to resolve those details where the model is unclear. Do not use “it starts on the thread” as purchasing proof, or assume that a nut from another range is acceptable because both descriptions say 22 mm. Colour, weight and a standards marking cannot settle every component-matching question.
Prepare photographs that answer the ordering question
Use clear photographs of markings and the accessible overall fitting, with enough surrounding context to show which component you mean. Include any labelled packaging already available. Identify which information is read from a label and which is only an estimate.
There is no need to disturb a working connection to prepare a shopping enquiry. If the required detail is hidden, say so and let the installer decide how to identify it safely. Avoid sending an unlabelled close-up of a hex nut as the only evidence: the receiving merchant still needs to know the host assembly.
Specify the component and the quantity separately
A nut-only listing should not be read as a complete fitting with an olive, sealing parts or a body. Ask which components the actual APM sale includes, and list any additional parts required by the confirmed specification separately.
The historical manufacturer row for this example shows a catalogue bag quantity. That is an ordering-pack detail in that source, not confirmation that an APM order supplies that bag. State the number of compatible nuts required and ask APM to confirm the sale unit. One photographed nut and a stock counter cannot answer that question.
Give the installer the service information
Include the intended service and the actual fitting's conditions when asking for a match. A component reference alone does not approve a complete joint for drinking water, heating, gas or a particular pressure and temperature. Ask for applicable supplied-model instructions and approval evidence where the specification requires them.
If the fitting cannot be identified reliably, ask the installer to specify the appropriate replacement assembly rather than guessing at a loose nut. That may change the shopping list; it should be an informed repair decision, not a conclusion drawn from a product photograph.
Send APM a usable replacement-part enquiry
Send the host fitting reference, accessible photographs, pipe specification, proposed nut reference, intended service and required quantity to WhatsApp 020 8702 8080 or 07737 263641. Check delivery information and the current order options. Confirm the exact part and timing before committing the job to a delivery date.
Leave a comment