Description
From a threaded fitting to flexible hose
Connect suitable 50mm-bore hose to a 1½-inch BSP female fitting with this straight black plastic adapter.
One end has an external BSP thread. The other is a ribbed hosetail for the hose, with a gripping collar between them.
One adapter supplied. Hose, clips and sealing parts are separate.
Two sizes, two different connections
The 50mm hosetail fits inside a suitable flexible hose. Select the hose by its bore, not by its outside diameter.
The 1½-inch BSP male thread mates with a compatible female-threaded fitting. BSP is a nominal pipe-thread size: it does not mean the external thread measures 38.1mm across. The reference image shows about 47.8mm over the thread.
Allow roughly 80mm overall length for the adapter, including around 50mm of hosetail, plus space for the hose and access to the joint.
Check the connection before assembly
Hose fit, thread compatibility and sealing each need attention.
Match the female fitting
Confirm that your pump, filter or other fitting accepts the 1½-inch BSP male thread. Check how that connection is designed to seal and use the appropriate sealing parts or method. Do not rely on the size label alone.
Fit the hose
Choose suitable 50mm-bore hose and follow the hose and fitting instructions for seating and securing it. Select a clip for the assembled hose diameter where required; the nominal bore alone does not set the clip size.
Support and inspect
Keep the hose supported so it does not pull sideways on the adapter. Avoid a sharp bend beside the hosetail, and inspect the assembled joints with water before covering the installation.
Before you order this adapter
Is this a 50mm thread or a 50mm hose connection?
The 50mm size describes the hosetail for a suitable hose with a nominal 50mm internal bore. The other end is a 1½-inch BSP male thread. These are two different connections, not two names for the same diameter. Check the hose and the female-threaded fitting separately before ordering, particularly when matching an existing pump or filter outlet.
Will it screw into every pond pump or filter?
No. The equipment needs a compatible 1½-inch BSP female connection, and the sealing arrangement must suit that connection. Some equipment uses other thread sizes, proprietary fittings or different sealing faces. Check its specifications and fitting instructions. The adapter’s size alone does not establish compatibility with every pump or filter.
Which hose clip should I use?
Choose a securing method suitable for your hose construction and this hosetail. Where a clip is needed, its range must cover the outside of the hose once fitted over the barb. A 50mm hose bore is not the same as that assembled outside diameter. Check the hose and clip instructions, avoid damaging the plastic fitting and inspect the finished joint with water.
What is supplied, and how much space does it need?
You receive one black plastic straight adapter. Hose, clips, mating fittings and sealing parts are not included. The dimension image shows approximately 80mm overall length and 50mm of hosetail. Allow additional room for the hose, the chosen securing method and access for installation or maintenance; avoid forcing a bend immediately beside the fitting.
Product information & technical details
| SKU | POND50B15BSPMSTR001 |
|---|---|
| Product type | |
| BSP thread size | 1.5" |
| Thread gender | Male |
| Barb size | 50mm (2") |
| Colour | Black |
| Material | Plastic |
|---|---|
| Connection layout | Straight; 50mm hosetail to 1½-inch BSP male |
| Overall length | Approximately 80mm |
| Hosetail length | Approximately 50mm |
| Mating connection | Compatible 1½-inch BSP female fitting and suitable 50mm-bore hose |
| Contents | 1 adapter; hose, clips, mating fitting and sealing parts not included |
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.