Description
A threaded outlet for your tank
These plastic water butt connectors provide a straight passage through a suitable tank wall, with a male BSP thread at each end.
Choose from five nominal thread sizes and connect matching female-threaded fittings separately.
Each connector comes with its retaining nut and sealing parts. Tank, tap and hose are not included.
Match the fitting at each end
The 1-inch example shown here has its back nut removed, making the threaded body and mounting parts easier to see. Both ends have external male threads; the centre is a water passage, not an internal female connection.
Choose a matching female BSP fitting for the end you intend to use. A hose connection needs a separate adapter suited to the hose, while a valve must have a compatible inlet and sealing arrangement.
The photograph shows the mounting parts for this example. Seal colour and component appearance can differ across the range.
Choose the nominal BSP size
Use the size selector above to order the connector that matches your threaded fittings.
| Selected option | Thread at both ends |
|---|---|
| 1/2 inch | 1/2-inch BSP male |
| 3/4 inch | 3/4-inch BSP male |
| 1 inch | 1-inch BSP male |
| 1.5 inch | 1.5-inch BSP male |
| 2 inch | 2-inch BSP male |
BSP is a nominal thread designation. It is not the required hole diameter: check the actual connector and tank wall before making an opening.
Plan the mounting before fitting
Allow access on both sides of the wall so the connector and retaining nut can be supported.
Check the wall
Choose a suitable mounting area with room for the connector, nut and seals to seat properly. Check the actual body against the opening and wall thickness, rather than drilling from the nominal BSP size.
Seat the sealing parts
Keep the mounting surfaces clean and position the supplied seals to suit the connector and wall. Hold the body while tightening the retaining nut, avoiding distortion of the plastic fitting or tank.
Connect and inspect
Add the appropriate female-threaded fitting with a seal suitable for that joint. Check the wall mounting and connected fittings for leaks before leaving water stored in the tank.
Questions about these tank connectors
Are both ends male BSP?
Yes. Each connector has the same nominal male BSP thread at both ends. Choose matching female-threaded fittings for your installation; the opening through the centre is not a female-threaded socket.
Can I screw a male-inlet tap directly into it?
No. A male tap inlet cannot screw directly into another male thread. You need a compatible female connection or a different tank adapter with the correct internal thread. Check the complete connection and sealing arrangement before ordering.
Does the BSP size tell me which hole to drill?
No. BSP sizes identify the nominal threads, not the mounting hole. Check the actual connector body, wall thickness and sealing surfaces before preparing an opening. This range does not provide a single universal drilling measurement.
What is supplied with my selected size?
You receive one connector in the selected BSP size with its retaining nut and sealing parts. The detailed photograph is a 1-inch example, so component appearance and seal colour may differ. Tank, tap, hose and additional adapters are sold separately.
Product information & technical details
| SKU | BUTT12BSPM001[#ML] |
|---|---|
| Product type | |
| BSP thread size | 1/2", 3/4", 1", 1.5", 2" |
| Thread gender | Male |
| Colour | Black |
| Material | Plastic |
| Available options | Size, colour and connection lists show available options across this range. One selected variant is supplied; select the required combination. |
|---|---|
| Thread layout | Male BSP at both ends |
| Available nominal sizes | 1/2, 3/4, 1, 1.5 and 2 inch BSP |
| Connector form | Straight through-wall connector |
| Retaining nut | Included |
| Pack contents | 1 selected connector with nut and sealing parts |
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.