Description
From a BSP port to your 38mm pond hose
Connect suitable 38mm-bore hose to equipment with a 1½-inch BSP female port using this straight plastic adapter.
The ribbed hosetail takes the hose, while the external male thread connects to the equipment. Check each end’s size and fitting requirements before assembly.
One black adapter supplied. Hose, clips and sealing accessories are sold separately.
Check the hose bore and thread diameter
A 38mm hose bore is commonly described as 1½-inch. The 1½-inch BSP male thread uses a different sizing convention: its external diameter is approximately 47.8mm in the dimension photo.
Check the female port’s stated BSP size as well as the hose bore. The 80mm overall length and 50mm hosetail section help you plan the fitting space. The image shows two views of one adapter.
Plan a connection you can reach and inspect
Choose the matching hose and securing accessories for the complete joint.
Check the port first
Use a matching 1½-inch BSP female port and follow its sealing instructions. Tighten plastic connections as directed by the equipment manufacturer. The hex shoulder is fixed to the body, not a swivel collar.
Seat the correct hose
Check that the hose has a suitable 38mm internal bore and wall profile. The separately listed 40mm bore is not the same size. Select a securing clip from the outside diameter of the fitted hose.
Support the hose bend
Allow a broad bend beyond the fitting and keep the hose’s weight off the equipment port. Leave access to the clip and thread, secure the hose appropriately and inspect both joints with water before covering the route.
Choosing the 1½-inch BSP version
Why does the 1½-inch BSP thread measure more than 38mm?
BSP uses nominal pipe-thread sizes. The external thread reference in the photograph is approximately 47.8mm for this 1½-inch BSP male fitting. The 38mm measurement refers separately to the intended hose bore, also commonly called 1½-inch. Match the equipment’s thread specification and the hose’s internal diameter rather than comparing the two inch labels as physical diameters.
Can I use the 40mm hose because it is also called 1½-inch?
The 38mm and 40mm hose ranges are separate nominal bores, even though both may carry a 1½-inch trade label. This adapter has a single-size hosetail for suitable 38mm internal-bore hose. Check the metric bore and wall profile against the fitting instructions. Do not assume that a securing clip will correct a mismatch between hose and hosetail sizes.
Is this the same adapter as the 38mm / 1¼-inch BSP version?
The hose size is the same, but the equipment threads differ. This version has a 1½-inch BSP male thread and needs a matching female port. The 1¼-inch BSP version is not interchangeable at the threaded end. Confirm the port size on the pump, filter or other equipment before ordering, even if your existing hose already matches the 38mm hosetail.
How much space is needed behind the equipment?
The adapter itself measures 80mm overall, including a 50mm hosetail section. Installed clearance also depends on how the threaded end engages, how the hose seats, the securing clip and the hose bend beyond it. Leave room to assemble and inspect both joints, and support the hose so its weight or sideways pull does not strain the plastic fitting.
Product information & technical details
| SKU | POND38B15BSPMSTR001 |
|---|---|
| Product type | |
| BSP thread size | 1.5" |
| Thread gender | Male |
| Barb size | 38mm (1.5") |
| Colour | Black |
| Material | Plastic |
|---|---|
| Connection layout | Straight 38mm hosetail to 1½-inch BSP male thread |
| Overall length | 80mm |
| Hosetail section length | 50mm |
| External thread diameter | Approximately 47.8mm; nominal 1½-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.