Description
A 19mm tank link
Join two suitable water butts with corrugated PVC hose and two ¾-inch BSP straight tank fittings.
The kit includes a 27mm HSS hole saw alongside the fittings, back nuts and washers. Select 1m to 5m of hose for the route you have planned.
Water butts, hose clips, power drill and any additional sealing materials are separate.
One kit, your chosen length
The hose length changes with your selection. The fitting and cutter quantities stay the same.
One length of pipe
Black corrugated PVC hose with a nominal 19mm internal diameter. Choose 1m, 2m, 3m, 4m or 5m, then trim it for your installation if needed. Its internal ridges are smoothed, rather than forming a completely flat inner wall.
Two straight fittings
Each plastic fitting has a ¾-inch BSP male tank thread, a hose barb for the pipe, and its mounting nut and washer. The pair provides one connection at each tank; no taps or automatic controls are included.
One mounting cutter
A 27mm HSS hole saw is included to make an opening for a suitable tank fitting. It does not cut a BSP thread. Check the fitting, tank wall and tool instructions before drilling, with room to access the nut inside.
Know the two connections
This photograph shows one of the tank fittings with its nut and washer removed. The threaded stem mounts at the tank; the ribbed hosetail grips inside the hose.
Choose a mounting area where the washer can sit evenly and the nut can be reached. Keep the seating surface clean, check wall thickness against the actual fitting and avoid excessive force on the plastic.
The tank washer does not hold the hose onto the barb. Use suitable clips separately, sized from the outside of the hose fitted over the barb. 16-27mm worm-drive hose clips are one option where that measured diameter is within their range.
Support the hose so it does not hang from the connectors. Check both tank-wall seals and both hose joints with water after fitting.
Measure before you drill
Position the tanks and plan the whole connection first.
Follow the hose route
Measure from one intended fitting to the other along the route the pipe will take. Include gentle bends and the pipe that slides onto each barb. A 1m hose does not necessarily span a 1m gap between tank walls.
Check the mounting
Look at the tank shape, mounting surfaces and internal access before preparing holes. If using an existing threaded connection, its BSP size and gender must match. This is not a universal fitting for every water butt.
Plan for full tanks
Keep suitable overflow provision available when both tanks fill. This kit connects them with a hose; it does not provide a complete overflow system, pump or automatic level controller.
Questions about the ¾-inch kit
Which size refers to the hose and which to the tank?
19mm describes the nominal internal diameter of the corrugated hose. The fittings have ¾-inch BSP male tank threads and matching hose barbs. The 27mm measurement is the included hole saw diameter. These measurements describe different parts of the kit.
Do longer options include more fittings?
No. Every option includes two straight fittings with their back nuts and washers, plus one 27mm HSS hole saw. Only the hose length changes between 1m and 5m. Select the pipe length for your route rather than expecting extra connectors in a longer kit.
Are clips included for securing the hose?
No. Choose suitable hose clips separately. Measure the hose outside diameter after it is fitted onto a barb and select a clip range that covers that measurement. The 19mm hose bore alone does not tell you the required clip size.
Does smooth bore mean a flat hose interior?
No. This corrugated hose has smoothed internal ridges. The smooth-bore description used for this pipe style does not mean a completely flat inner wall. Keep turns gentle and avoid crushing the hose when routing it or tightening a clip.
Product information & technical details
| SKU | WB34LINK-001M+DB |
|---|---|
| Product type | |
| Length | 1m, 2m, 3m, 4m, 5m |
| Internal diameter | 19mm (3/4") |
| BSP thread size | 3/4" |
| Thread gender | Male |
| Barb size | 19mm (3/4") |
| Kit parts | Corrugated hose in selected length, 2 straight tank connectors, Back nuts and washers, 27mm HSS hole saw |
| Colour | Black |
|---|---|
| Material | Plastic, Steel |
| Included cutter | 27mm HSS hole saw |
| Straight tank fittings | 2 × ¾-inch BSP male to 19mm 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.