Frequently asked questions about the Taps and valves category
What are Taps and valves and what are they used for?
Taps and valves are shut-off and control fittings for plumbing and heating systems, including ball valves, angle valves and safety valves. They are used to isolate water, connect washing machines, protect against overpressure and for frost-proof outdoor taps (e.g. NORDLINE 400 mm NL400).
How to choose between a ball valve and an angle ball valve for a boiler or radiator?
Choose an angle ball valve (e.g. ARCO 1/2x1/2 XL FLOW) when you need a 90° turn or space is limited. A straight ball valve suits inline runs; always match thread/connection size (1/2, 3/4 etc.) and type to your pipes and fittings.
What do press valve sizes mean and should I choose 16x16 or 20x20?
Press valve size matches the pipe outer diameter: 16x16 for 16 mm pipes and 20x20 for 20 mm pipes. Also confirm the press fitting compatibility with your pipe material (copper or plastic).
What safety valves are available and should I pick 1.5 bar or 10 bar for a domestic boiler?
Safety valves come with different set pressures: 1.5 bar is typical for heating systems and small boilers, while 10 bar suits higher-pressure water mains. Choose a valve that matches your system's operating pressure as specified in the boiler/system manual.
Which taps are suitable for connecting a washing machine and what's the difference between 40x22-28 and 32x22-28?
Washing machine connectors are angled fittings like 40x22–28 mm or 32x22–28 mm; 40x22–28 fits larger pipe/hose diameters than 32x22–28. Choose based on your machine’s inlet size and the pipe/hose diameter available.
Which tap is best for outdoor water supply and how does the frost-proof NORDLINE NL400 differ?
The NORDLINE 400 mm NL400 frost-proof tap has an extended body that prevents water from freezing inside the tap. Choose frost-proof taps for garden spigots and irrigation where freeze protection is required.
How does the mini ball valve 3/4 SK-VK differ from a standard ball valve in use?
The mini ball valve 3/4 SK-VK is more compact, ideal for tight spaces and point connections. A standard ball valve has a larger body and is better suited for mainline applications where space is not restricted.
How to check tap thread compatibility with my existing pipe — metric/BSP/unified sizes?
Check the thread type (metric, BSP/G or imperial) and nominal size (e.g. 1/2, 3/4) listed for the product. Measure your pipe’s outer/inner diameter and compare with the product specification or a thread size chart to confirm compatibility.
Are the ball valves in the catalogue suitable for drinking water and what materials are used?
Valves suitable for drinking water are typically brass with food-grade coatings or stainless steel; product pages will state 'suitable for drinking water' and list materials. Check the product description for material specifications and drinking-water approval before installation.
Which tap should I pick for a narrow space near a wall — are there narrow ground tap options?
For tight wall spaces choose a 'Narrow ground tap 25T' or compact angle valve models. Look for short shank or slim-profile specifications so the handle clears the wall.