Description
A half-inch tank link
Connect two suitable water butts with 13mm corrugated hose and a pair of ½-inch BSP tank fittings.
This version also includes a 21mm HSS hole saw. Choose one hose length from 1m to 5m; the fittings, mounting parts and cutter are the same with every option.
Hose clips, water butts, a power drill and any extra sealing materials are supplied separately.
Two ends, two seals
Each straight fitting has a ½-inch BSP male thread for mounting at the tank and a hose barb for the 13mm pipe. The photograph shows one fitting with its back nut and washer removed.
Check the tank wall, seating area and access before marking an opening. The washer belongs at the tank mounting; it does not secure the hose onto the barb.
Push the hose fully onto each barb and use suitable hose clips separately. Size a clip from the outside of the fitted hose, not from its internal bore. 12-20mm worm-drive hose clips are an option where the measured outside diameter is within that range.
Keep the hose supported so it does not pull on either connector. Check the tank-wall mountings and the hose joints with water after fitting.
Choose the length, keep the kit
Every option has the same parts. Only the hose length changes.
Hose for your route
Select 1m, 2m, 3m, 4m or 5m of black corrugated PVC hose. Measure along the route between the proposed fittings, allowing for bends and hose engagement at both ends. Leave room for a gentle curve rather than stretching the hose tight.
Two tank connections
Two straight plastic hosetails are included, with their back nuts and washers. Confirm that both tanks have suitable mounting areas and that the nuts can be reached from inside. Tanks and shut-off valves are not included.
Cutter included
One 21mm HSS hole saw is supplied. Check it against the actual fitting and tank material before cutting, and follow the instructions for your power tool. It makes an opening for a retained fitting; it does not form a threaded outlet.
Leave room for rainwater
A link is one part of the wider tank arrangement.
Plan where excess water can go when both tanks are full. This kit supplies a hose connection between them, rather than an automatic level controller or a complete overflow system. Keep the tank bases stable, the hose route accessible and any existing overflow provision clear.
The pipe is described as smooth bore, but it still has smoothed internal ridges. Avoid tight turns or clip pressure that flatten the hose, and check the route again once everything is in position.
Questions before fitting
Is 13mm the same option as ½ inch?
Yes. This is the nominal half-inch hose option, listed as 13mm in the hose specification. The fittings also have half-inch BSP male tank threads. Hose bore and BSP thread designations describe different parts of the connection; neither is an outside hose measurement.
What is supplied with each length?
One selected length of corrugated hose, two straight tank fittings with their back nuts and washers, and one 21mm HSS hole saw. The 1m to 5m options change only the hose length. Water butts, hose clips and a power drill are separate.
Can I choose a length equal to the gap between tanks?
Measure the hose route between the fitting positions instead of only the empty gap between the tanks. Allow for gentle bends and the hose pushed onto each barb. The supplied length needs to cover that whole route without pulling on either fitting.
Will the cutter make a threaded connection?
No. The 21mm hole saw cuts an opening for the fitting, which is held with its back nut and washer. Check the actual fitting, wall thickness, seating surface and internal access before drilling. It is not a universal-fit promise for every tank.
Product information & technical details
| SKU | WB12LINK-001M+DB |
|---|---|
| Product type | |
| Length | 1m, 2m, 3m, 4m, 5m |
| Internal diameter | 13mm (1/2") |
| BSP thread size | 1/2" |
| Thread gender | Male |
| Barb size | 13mm (1/2") |
| Kit parts | Corrugated hose in selected length, 2 straight tank connectors, Back nuts and washers, 21mm HSS hole saw |
| Colour | Black |
|---|---|
| Material | Plastic, Steel |
| Included cutter | 21mm HSS hole saw |
| Straight tank fittings | 2 × ½-inch BSP male to 13mm hose barb |
| Tank mounting | Back nut and washer for each fitting |
| Hose material | Flexible PVC |
| Hose bore profile | Smoothed internal ridges; not completely flat |
What is BSP?
What is BSP thread size?
BSP (British Standard Pipe) is a nominal pipe-thread size, not a direct measurement of a fitting’s bore or outside diameter. For example, a ½-inch BSP male thread measures about 21mm across its outer thread crests.
These figures are approximate outside diameters of male BSP threads, to help identify the nominal size. They are not inch-to-millimetre unit conversions:
- 3/8" BSP → 16.66 mm
- 1/2" BSP → 20.95 mm
- 3/4" BSP → 26.44 mm
- 1" BSP → 33.25 mm
- 1.25" BSP → 41.91 mm
- 1.5" BSP → 47.80 mm
- 2" BSP → 59.61 mm
- 3" BSP → 87.88 mm
- 4" BSP → 113.03 mm
All our BSP threads are parallel (BSPP, to ISO 228), not tapered.
Measure across the outside of a male thread, then check its pitch and whether it is parallel or tapered. Diameter alone does not confirm compatibility. Check the product’s stated thread specification before connecting.
All delivery times are estimates and not guaranteed. Orders placed before 1 pm, Monday to Friday (excluding bank holidays), will be dispatched the same day, while orders placed after 1 pm will be dispatched by the end of the next working day.
If an invalid postcode or address is provided, the order will be cancelled without further notice, as we are unable to modify addresses or print labels for invalid postcodes.
Our standard delivery option is Royal Mail Tracked 48, which typically takes 3–5 business days. If you need your order more quickly, Expedited delivery via Royal Mail Tracked 24 is available, offering a 1–2 business day service.
Large or bulky items may be sent via courier at our discretion and are usually dispatched for next-day delivery. Please note that we only ship to mainland UK addresses; delivery to non-mainland locations, including the Highlands & Islands, may not be available for large or heavy items. If your address falls into one of these areas and you wish to purchase such items, please contact us with your postcode and order details before placing your order. If we cannot ship to you, you are welcome to arrange your own courier for collection.
All products, unless otherwise stated, come with a standard manufacturer warranty against faulty workmanship.
If your product fails within six months of delivery, please contact us with your order reference number, a description of the issue, and clear images illustrating the fault.
Should your item require a return for further investigation, it is your responsibility to arrange and cover postage back to us.
If we are unable to repair the fault, we may offer either a replacement or a full refund.
In cases where the item is inspected and found not to be faulty, or where damage is determined not to be due to manufacturing defects, you will not be entitled to a refund or replacement. We will then either return the item to you via standard post or dispose of it at your request.
You may return any order within 14 days of delivery. As soon as you receive your items, please inspect them carefully, taking reasonable care to keep both the product and its packaging clean and undamaged. If you discover an error or defect after 14 days, we reserve the right to decline your return. If your product fails or breaks after this 14-day time window then your order may be eligible for a warranty claim, please see our warranty information for more details.
To initiate a return, please contact us via our contact form to obtain a return authorisation and the correct returns address (different from the address on your invoice). This can also be done through your 'recent orders' page on your account if you are registered with Shop. Returns sent without prior authorisation will be discarded.
Returned items must be in the same condition in which you received them: unworn or unused, with tags attached and in their original packaging. You must include either a copy of your invoice or a slip with your order reference number inside the parcel. Please be sure not to obscure your return reference number on the label.
If you refuse delivery or reject the parcel without prior notice, we will inspect the returned package and issue a refund upon receipt. Although there is no restocking fee, we will deduct the cost of the return postage label (£3.35) from your refund.
If the returned item or its packaging shows signs of use, damage, or staining, we may deduct up to 50% of the order value, or refuse the return entirely, depending on its condition. Examples include damaged tags, stained, modified or damaged packaging, or missing components.
For faulty, incorrect, or damaged items, please contact us before sending anything back so we can attempt to resolve the issue directly. If we agree that a return is necessary due to our error, we will provide you with a pre-paid return label.
Products that have been modified or damaged through customer action are not eligible for return. This includes, but is not limited to, items that have been cut, trimmed or otherwise altered (such as a tarpaulin or pond liner resized to your specifications), or any product showing damage beyond normal inspection handling.
All delivery times are estimates and not guaranteed. Orders placed before 1 pm, Monday to Friday (excluding bank holidays), will be dispatched the same day, while orders placed after 1 pm will be dispatched by the end of the next working day.
If an invalid postcode or address is provided, the order will be cancelled without further notice, as we are unable to modify addresses or print labels for invalid postcodes.
Our standard delivery option is Royal Mail Tracked 48, which typically takes 3–5 business days. If you need your order more quickly, Expedited delivery via Royal Mail Tracked 24 is available, offering a 1–2 business day service.
Large or bulky items may be sent via courier at our discretion and are usually dispatched for next-day delivery. Please note that we only ship to mainland UK addresses; delivery to non-mainland locations, including the Highlands & Islands, may not be available for large or heavy items. If your address falls into one of these areas and you wish to purchase such items, please contact us with your postcode and order details before placing your order. If we cannot ship to you, you are welcome to arrange your own courier for collection.
All products, unless otherwise stated, come with a standard manufacturer warranty against faulty workmanship.
If your product fails within six months of delivery, please contact us with your order reference number, a description of the issue, and clear images illustrating the fault.
Should your item require a return for further investigation, it is your responsibility to arrange and cover postage back to us.
If we are unable to repair the fault, we may offer either a replacement or a full refund.
In cases where the item is inspected and found not to be faulty, or where damage is determined not to be due to manufacturing defects, you will not be entitled to a refund or replacement. We will then either return the item to you via standard post or dispose of it at your request.
You may return any order within 14 days of delivery. As soon as you receive your items, please inspect them carefully, taking reasonable care to keep both the product and its packaging clean and undamaged. If you discover an error or defect after 14 days, we reserve the right to decline your return. If your product fails or breaks after this 14-day time window then your order may be eligible for a warranty claim, please see our warranty information for more details.
To initiate a return, please contact us via our contact form to obtain a return authorisation and the correct returns address (different from the address on your invoice). This can also be done through your 'recent orders' page on your account if you are registered with Shop. Returns sent without prior authorisation will be discarded.
Returned items must be in the same condition in which you received them: unworn or unused, with tags attached and in their original packaging. You must include either a copy of your invoice or a slip with your order reference number inside the parcel. Please be sure not to obscure your return reference number on the label.
If you refuse delivery or reject the parcel without prior notice, we will inspect the returned package and issue a refund upon receipt. Although there is no restocking fee, we will deduct the cost of the return postage label (£3.35) from your refund.
If the returned item or its packaging shows signs of use, damage, or staining, we may deduct up to 50% of the order value, or refuse the return entirely, depending on its condition. Examples include damaged tags, stained, modified or damaged packaging, or missing components.
For faulty, incorrect, or damaged items, please contact us before sending anything back so we can attempt to resolve the issue directly. If we agree that a return is necessary due to our error, we will provide you with a pre-paid return label.
Products that have been modified or damaged through customer action are not eligible for return. This includes, but is not limited to, items that have been cut, trimmed or otherwise altered (such as a tarpaulin or pond liner resized to your specifications), or any product showing damage beyond normal inspection handling.