Description
A 38mm hose connection for a 1¼-inch BSP port
Bring suitable 38mm pond hose to equipment with a matching 1¼-inch BSP female connection.
This straight black plastic adapter has a ribbed hosetail at one end and an external male thread at the other. Check both sizes independently before choosing your fitting.
One adapter supplied. Hose, clips and sealing accessories are separate.
Two connection sizes, one straight fitting
The 38mm hosetail and 1¼-inch BSP male thread are separate specifications. The thread’s external diameter is shown at approximately 41.91mm; BSP is a nominal thread size.
The adapter is 80mm long overall, with a 50mm hosetail section. Use these dimensions to plan the fitting position, then leave room for the hose and clip. The photograph shows two views of one adapter.
Match the port, fit the hose, support the run
Hose and securing accessories are chosen separately for your installation.
Confirm the female port
Check for a 1¼-inch BSP female connection. Follow the equipment’s sealing and tightening guidance for plastic fittings. The hex shoulder is part of the body, not an independently turning swivel.
Choose suitable 38mm hose
Match the internal bore and wall profile to the ribbed hosetail. A hose labelled 40mm is a different nominal bore, even if it also uses a 1½-inch trade label. Select the clip from the fitted outside diameter.
Leave access to both joints
Support the hose beyond the fitting and form a gentle bend without sideways pull on the equipment port. Secure the hose appropriately and inspect the assembled joints with water before covering the route.
Questions about the 38mm threaded adapter
Why is the hose size 1½-inch but the thread 1¼-inch?
The two ends use different sizing conventions and do different jobs. The hosetail is intended for suitable 38mm internal-bore hose, often called 1½-inch. The external male thread is nominal 1¼-inch BSP and needs a matching female port. Choose the adapter by both specifications; the inch label on your hose does not determine the equipment thread.
Will this fit a 1½-inch BSP female pump outlet?
No. This adapter has a 1¼-inch BSP male thread. Its 38mm hose connection does not make the threaded end 1½-inch BSP. Check the pump or filter’s stated port size and gender, as well as the hose bore. A different thread-size adapter is needed if the equipment port is specified as 1½-inch BSP female.
What do the 80mm and 50mm measurements refer to?
The dimension photo shows an 80mm overall adapter length and a 50mm hosetail section. These are fitting dimensions rather than the clearance required for the finished hose run. Leave room for the hose to seat on the barb, the securing clip and a gentle bend. Thread engagement changes the installed position; check the complete arrangement beside your equipment.
What else is needed to complete the joint?
This listing supplies one bare plastic adapter. You need suitable 38mm-bore hose, an appropriate securing clip and any sealing accessories specified for the female port. Select the clip from the fitted hose outside diameter and wall profile. Follow the equipment’s instructions for tightening plastic threads, support the hose and inspect both joints with water.
Product information & technical details
| SKU | POND38B125BSPMSTR001 |
|---|---|
| Product type | |
| BSP thread size | 1.25" |
| Thread gender | Male |
| Barb size | 38mm (1.5") |
| Colour | Black |
| Material | Plastic |
|---|---|
| Connection layout | Straight 38mm hosetail to 1¼-inch BSP male thread |
| Overall length | 80mm |
| Hosetail section length | 50mm |
| External thread diameter | Approximately 41.91mm; nominal 1¼-inch BSP |
| Contents | One adapter; hose, clips and equipment 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.