No. Matching BSP threads do not make gas and water fittings interchangeable. A fitting can be used only where the exact product is approved, rated and documented for that service, even when its material, size and thread appear identical.
What determines suitability?
A suitable fitting must meet the requirements of the complete pipework system, including:
- Intended service: Manufacturer documentation must identify the fitting as suitable for the particular gas or water application.
- Material compatibility: The body, seals and jointing materials must be compatible with the substance carried and the connected pipework.
- Pressure and temperature ratings: These must cover the system’s operating conditions.
- Connection and sealing method: Matching threads or dimensions do not confirm that the joint will seal safely or that the joining method is approved.
- Product certification: Where Australian certification requirements apply, the fitting must have the relevant approval for its intended use. WaterMark certification applies to plumbing products within the scheme’s scope.
Can one fitting be used for both?
Only if the exact product is documented as suitable for both gas and water. Appearance, colour, material and the ability to connect are not proof.
Without loosening or altering the fitting, check its permanent markings, original packaging, model number and current manufacturer documentation. If these details are missing or inconsistent, treat its suitability as unconfirmed.
Do not select, alter or install gas fittings yourself. Gas fitting work in NSW requires an appropriately licensed professional, who must confirm that the fitting, pipe and joining system are suitable together. If a fitting’s approval is uncertain, contact our Sydney gas fitting team for an assessment before it is installed or used.