Description
Reduce the outlet
Bring a 1-inch BSP tank connection down to a ¾-inch BSP female outlet with this two-piece plastic adapter kit.
A double-male tank connector joins to a separate reducing socket. The assembled fitting presents a 1-inch male thread at the tank end and a ¾-inch female socket at the outlet.
Back nut and two mounting washers included. Tank, tap, hose and additional sealing materials are separate.
How the parts connect
The socket reduces the outlet while the tank connector provides the mounting.
Tank connector
The connector has 1-inch BSP male threads at both ends. Its flange, washers and back nut allow a suitable through-wall mounting. For an existing threaded tank outlet, match the exposed male thread to a 1-inch BSP female connection.
Reducing socket
The separate socket has female threads at both ends: 1-inch BSP on the larger side and ¾-inch BSP on the smaller side. Screw its 1-inch side onto the tank connector’s remaining male end, with an appropriate seal at that joint.
Your chosen outlet
The free ¾-inch female end accepts a matching male-threaded fitting. A separately sold ¾-inch BSP male bib tap is one option. Check handle clearance, support and the hose connection your installation needs.
Mount the connector first
This photograph shows the 1-inch tank connector on its own, with the retaining nut removed to reveal the mounting parts. The separate reducing socket is shown attached in the illustration above.
For a suitable tank wall, seat one washer against the flange, pass the threaded stem through the prepared opening, then fit the other washer and nut on the opposite side. Keep the seating surfaces clean and avoid overtightening the plastic parts.
Check the actual connector against the wall thickness and opening before cutting. A BSP thread designation is not a drilling measurement.
After fitting the socket and chosen outlet, check the tank-wall seal and every threaded joint with water. The mounting washers do not seal the separate socket-to-connector or tap joints.
Questions about the reducer kit
What threads remain after the kit is assembled?
A 1-inch BSP male thread at the tank end and a ¾-inch BSP female outlet. The 1-inch female side of the reducing socket is used to join the socket to the tank connector; it is not the exposed tank connection of the assembled kit.
Is this one moulded reducer or two separate fittings?
It is a two-piece kit: one 1-inch BSP double-male tank connector and one reducing socket with 1-inch and ¾-inch BSP female threads. The tank connector also comes with a back nut and two mounting washers.
Does it include a tap or hose connector?
No. Choose a matching ¾-inch BSP male fitting separately for the female outlet. If you choose a tap, also check its hose connection and handle clearance. A tap, hose, tank and any additional thread-sealing materials are not included.
Do the mounting washers seal every connection?
No. They are provided for a suitable tank-wall mounting between the connector flange and back nut. The reducing socket and any tap or other fitting need appropriate sealing at their separate threaded joints. Inspect all connections after assembly.
Product information & technical details
| SKU | BUTT1BSPM001+SOC1-34 |
|---|---|
| Product type | |
| BSP thread size | 3/4", 1" |
| Thread gender | Male, Female |
| Colour | Black |
| Material | Plastic |
| Assembled tank connection | 1-inch BSP male |
|---|---|
| Assembled outlet | ¾-inch BSP female |
| Reducing socket connections | 1-inch BSP female × ¾-inch BSP female |
| Mounting parts | 1 back nut and 2 mounting washers |
| Supplied fittings | 1 double-male tank connector and 1 reducing socket |
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.