Unifix Openlok pipe clips are made from heavy grade heat-resistant polypropylene and available in single and double formats across 15mm, 22mm and 28mm sizes. A single screw fixes each clip with the pipe already in place.
Available options and pricing for Unifix / FM Products Openlok Pipe Clips, with quantity selectors and a running total
Size
Product Type
QTY
SKU
Price
QTY
Total
15mm
SINGLE
100
PC-SOL-15
£6.99£8.39
—
22mm
SINGLE
100
PC-SOL-22
£8.49£10.19
—
28mm
SINGLE
100
PC-SOL-28
£15.49£18.59
—
15mm
DOUBLE
50
PC-DOL-15
£8.98£10.78
—
22mm
DOUBLE
50
PC-DOL-22
£10.93£13.12
—
28mm
DOUBLE
50
PC-DOL-28
£17.99£21.59
—
Unifix Openlok pipe clips have been a trusted staple on British plumbing and heating jobs for over 25 years. Made from heavy grade heat-resistant polypropylene, these clips are built to handle the temperatures you’d expect from central heating pipework without sagging, cracking or losing their grip. If you’ve ever had a clip deform around a hot flow pipe, you’ll know why the material specification actually matters here.
The defining feature of the Openlok design is the single screw fixing. You can fix the clip to the wall or joist with the pipe already sitting in it, which cuts out the fiddly step of positioning the pipe after fixing. On a long pipe run, that saves a noticeable amount of time. It also means you can make adjustments without fully disturbing everything you’ve already clipped off.
Openlok Pipe Clips: Single and Double Formats
Openlok pipe clips come in both single and double versions. Single clips are the go-to for most standard runs, while double clips are useful where two parallel pipes run close together and a shared fixing point makes more sense than two separate ones. Both formats are available in 15mm, 22mm and 28mm to cover the pipe sizes you’ll encounter on the vast majority of domestic and light commercial installations.
The clips are sold in box quantities of 50 or 100 depending on size, so they’re practical to buy in bulk for larger jobs rather than picking up a card of ten from a plumbers’ merchant every time you need more.
Unifix also produce a range of accessories to complement the Openlok system, covering brackets, backplates and other fixing solutions that work with the same clip design. Worth knowing if you’re fitting out a full plant room or dealing with an awkward installation.
Pro Tip: When clipping copper pipe on a hot water system, leave a small amount of free movement in the clip rather than overtightening the fixing screw, as copper expands noticeably with temperature changes and a rigid fix can cause noise or stress on joints over time.
Unifix Openlok pipe clips are used by plumbers, heating engineers and general builders to secure copper and plastic pipework to walls, joists, studwork and ceilings. They are suitable for domestic central heating systems, hot and cold water supplies, and light commercial pipework installations. The heat-resistant polypropylene construction makes them appropriate for use on flow and return pipework where standard clips would soften or distort.
Best For
Domestic central heating pipework
Hot and cold water supply runs
Light commercial plumbing installations
Copper and plastic pipe fixing to walls and joists
Available In
15mm single and double
22mm single and double
28mm single and double
Box of 50 or 100 depending on size
Key Features
Heavy grade heat-resistant polypropylene
Single screw fixing with pipe already in place
Single and double clip formats
Compatible with Unifix Openlok accessory range
Over 25 years of trade use
Not suitable for: Not intended for use with gas pipework, which requires metal clips conforming to gas installation regulations. Not suitable for pipe sizes outside the 15mm, 22mm and 28mm range.
Offer the Openlok clip up to the pipe and press the pipe into the open slot. Position the clip against the wall or joist at the required fixing point and drive a single screw through the fixing hole to secure. The clip can be fixed with the pipe already in position, which is the main time-saving benefit of the Openlok design.
For longer runs, use standard pipe clip spacing guidelines: typically 500mm centres for horizontal copper pipe on 15mm, and slightly wider centres on larger diameters. On vertical runs, increase spacing slightly. Always check the pipe is properly seated in the clip before moving on.
Select the correct clip size to match your pipe diameter: 15mm, 22mm or 28mm.
Choose single or double format depending on whether you are clipping one pipe or two parallel pipes at the same point.
Offer the pipe into the open slot of the clip so it seats fully.
Hold the clip against the fixing surface at the correct spacing for the pipe size and run orientation.
Drive a single screw through the fixing hole to secure the clip and pipe in one step.
Check the pipe is seated correctly in the clip and has a small amount of free movement to allow for thermal expansion on hot systems.
Can Openlok pipe clips be used on plastic push-fit pipe as well as copper?
Yes, Openlok clips work with both copper and plastic pipe. The clip sizes correspond to standard pipe outside diameters, so a 15mm clip will fit both 15mm copper and 15mm plastic pipe of the same outside diameter. Always confirm the outside diameter of your specific plastic pipe product before ordering.
What is the difference between the single and double Openlok clip?
A single clip holds one pipe and uses one fixing screw. A double clip holds two parallel pipes side by side at a single fixing point, which is useful where two pipes run close together and a shared bracket saves space and reduces the number of fixings into the wall or joist.
Unifix Openlok pipe clips are manufactured from heavy grade polypropylene formulated to resist the elevated temperatures associated with central heating and hot water pipework. The material maintains its structural integrity at typical domestic system flow temperatures, avoiding the deformation seen with standard grade plastic clips on hot pipe runs. The open-slot design accepts the pipe before the clip is screwed off, and the single central fixing point distributes load evenly across the clip body.
Material
Heavy grade heat-resistant polypropylene
Available Sizes
15mm, 22mm, 28mm
Clip Formats
Single, Double
Box Quantity
50 or 100 (size dependent)
Fixing Method
Single screw
Brand
Unifix
Weight
N/A
Size
15mm, 22mm, 28mm
Product Type
DOUBLE, SINGLE
Box Quantity
100, 50
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