WRAS approved 15mm end feed slip coupling, sold in bags of 25. Used for joining or repairing copper pipe where a standard coupling won’t slide back far enough. A reliable trade staple for plumbers working on domestic and commercial pipework.
The 15mm end feed slip coupling is a straightforward but genuinely useful fitting for any plumber working on copper pipework. Unlike a standard end feed coupling, the slip coupling has no internal stop, which means the fitting can slide fully along the pipe in either direction. This makes it the go-to choice when repairing a section of existing pipework where you cannot pull the pipe ends apart far enough to fit a standard coupling. If you’ve ever tried to replace a corroded or leaking section mid-run, you’ll know exactly why this fitting exists.
Each bag contains 25 fittings, which makes this a practical buy for anyone doing volume repair work or wanting stock on the van. At 15mm, these are sized for standard household copper pipe and will suit the vast majority of domestic heating and plumbing repair jobs. The end feed design means you apply solder to the cup end of the fitting after assembly, giving a permanent, watertight joint when done correctly.
Why WRAS Approval Matters on an End Feed Slip Coupling
These 15mm end feed slip couplings carry WRAS approval, which stands for the Water Regulations Advisory Scheme. WRAS approval confirms that the fitting has been independently tested and is suitable for use in contact with drinking water in the UK. On any job involving potable water supply, using WRAS approved fittings is the right call, and on some contracts it is a requirement. It is also worth noting that most local water authorities and building control inspectors will want to see WRAS approved materials specified on new installs and significant repairs.
The fittings are manufactured to meet the dimensional standards expected from quality copper end feed fittings, giving a consistent fit on standard 15mm copper tube. Consistency matters when you are sweating multiple joints in a session, because you want the same amount of solder draw every time, not a lottery of tight and loose fits.
Bag Quantity for Trade Use
Buying in bags of 25 makes sense for anyone doing regular plumbing work. A single repair job might only need one or two slip couplings, but having a bag on the van means you are not caught short when a second issue shows up on the same visit. Keeping a stock of end feed slip couplings alongside standard couplings, elbows, and tees is the kind of sensible preparation that separates a well-equipped plumber from one making return trips to the merchant.
These fittings are suitable for use on domestic hot and cold water systems, central heating pipework, and general copper tube installations. They work with standard 15mm copper pipe to BS EN 1057 and are compatible with lead-free solder, which is the correct choice for potable water applications.
Pro Tip: When using a slip coupling on a mid-run repair, slide the fitting fully onto one pipe end first, make your cut and clean-up, then slide the fitting back to centre the joint before soldering, so both pipe ends sit equally inside the coupling for a sound joint on each side.
The 15mm end feed slip coupling is used primarily for repairing existing copper pipework where a section of pipe needs to be cut out and replaced. This is common on older domestic plumbing systems where pipes have corroded, pinholed, or been damaged. Because the fitting has no internal stop, it can be manoeuvred over a fixed pipe run and repositioned, making mid-run repairs practical without the need to cut back large sections or disturb surrounding pipework.
Plumbers and heating engineers use these fittings on domestic hot and cold water systems, central heating circuits, and general copper tube installations in commercial and residential properties. They are equally at home on a quick one-off repair job or as part of a larger refurbishment where sections of pipework are being replaced throughout a property.
Best For
Mid-run copper pipe repairs
Replacing damaged or corroded pipe sections
Domestic hot and cold water systems
Central heating pipework
Situations where pipe ends cannot be pulled apart
Compatible With
15mm copper tube to BS EN 1057
Lead-free solder (required for potable water)
Standard end feed flux and solder wire
Domestic and commercial plumbing systems
Key Properties
WRAS approved for drinking water contact
No internal stop for full-slide movement
End feed solder joint construction
25 fittings per bag
15mm bore
Not suitable for: Not suitable for use on gas pipework. These fittings are designed for copper water and heating systems only and should not be used with plastic or push-fit pipe systems.
Before fitting, cut out the damaged pipe section cleanly using a pipe cutter for a square end. Deburr and clean both pipe ends with wire wool or emery cloth until the copper is bright. Apply flux to both pipe ends and to the inside of the slip coupling.
Slide the coupling fully onto one pipe end, offer the other pipe end into position, then slide the coupling back so both pipe ends sit equally inside the fitting. Apply heat evenly around the barrel of the fitting with a blowtorch until the flux begins to bubble, then feed lead-free solder wire into the joint. Capillary action will draw the solder into the gap. Allow the joint to cool before pressure testing. Wipe away excess flux residue once cool.
Cut out the damaged pipe section using a pipe cutter, keeping the cut square
Deburr both pipe ends and clean the outside of each with wire wool or emery cloth until bright copper is visible
Clean the inside of the slip coupling with a small piece of emery cloth or a fitting brush
Apply flux to both pipe ends and to the inside of the coupling cup
Slide the coupling fully onto one pipe end and manoeuvre the second pipe end into position
Centre the coupling so both pipe ends are seated equally inside the fitting
Apply heat evenly around the fitting with a blowtorch until flux bubbles and the fitting is up to temperature
Feed lead-free solder into the joint at the cup edge and allow capillary action to draw it in until a ring of solder appears
Remove heat and allow the joint to cool naturally without disturbing it
Wipe away flux residue with a damp cloth once cool, then pressure test before closing the system
What is the difference between a slip coupling and a standard end feed coupling?
A standard end feed coupling has an internal stop that centres the two pipe ends inside the fitting. A slip coupling has no stop, so it can slide fully over the pipe in either direction. This is essential for mid-run repairs where the pipe is fixed at both ends and cannot be pulled apart to accept a standard coupling.
Are these 15mm slip couplings suitable for drinking water pipework?
Yes. These fittings carry WRAS approval, which confirms they have been independently tested and are suitable for use in contact with potable water in the UK. You should also use lead-free solder when making joints on any drinking water pipework.
Can I use these slip couplings on a central heating system as well as cold water?
Yes, these 15mm end feed slip couplings are suitable for both domestic hot and cold water systems and central heating circuits. They are compatible with standard 15mm copper tube to BS EN 1057 and will handle the operating temperatures and pressures found in typical residential heating systems.
These 15mm end feed slip couplings are manufactured from copper and conform to the dimensional requirements for end feed fittings designed to accept standard 15mm copper tube to BS EN 1057. The slip design omits the internal stop present in a standard coupling, allowing the fitting to travel freely along the pipe. WRAS approval confirms suitability for use in potable water systems in the UK. Compatible with lead-free solder as required for drinking water applications.
Size
15mm
Fitting Type
Slip Coupling (no internal stop)
Connection Type
End Feed (solder)
Approval
WRAS Approved
Compatible Pipe Standard
BS EN 1057 copper tube
Solder Compatibility
Lead-free solder
Pack Quantity
25
Material
Copper
Size
15mm, 22mm
Box Quantity
25
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