Twinwall Coupler - 600mm Black
If a Sealed Carrier System is Required Use 2 Seals per Joint
Twinwall drainage is predominantly used in stormwater applications where the strength of the pipe is key, such as under roads, sports pitches and landscaped areas. Because of their high compressive strength they can also be buried much deeper than standard PVC drainage pipes as they can easily support a greater weight of soil backfill.
There are two options when connecting fittings to twinwall pipes – they can either be loose jointed or sealed joints. Sealed joints, used with unperforated twinwall pipes in stormwater drainage applications, require separate seals to be inserted over the pipe prior to the fitting being connected. Loose joints (used with perforated twinwall pipes in land drain applications) use the same fittings but without the need for the rubber seal, allowing more rainwater to be collected into the pipes at the joint location.
Twinwall pipes are made from HDPE (high density polyethylene). The outer ribs add compressive strength whilst the smooth inner bore promotes a friction-free flow of water.
To cut twinwall pipes, just use one of the ribs as a guide and cut with a standard handsaw.
Orders placed by 12.00 noon will be delivered the next working day. Orders placed at weekends will be delivered on the following Tuesday. Read our delivery details for further information.
Our Returns Policy
You can return any items for a full refund (excluding any carriage charges) within 28 days of your purchase - the only exception being specially manufactured items such as fabricated gutter angles or profiles which cannot be returned. All returned items must be unused and in saleable condition. You should include a copy of your original purchase invoice with any goods that you return.
Please note that you are responsible for the cost of returning unwanted items. If you are unsure of how to go about arranging a carrier please let us know so that and we can assist you with this, although you should be aware that we cannot be held responsible for any carrier losses or damages prior to the goods being checked in at our warehouse.
Please click here to download a Goods Returns Form which you should enclose with any returned items. Our full postal address for returns is detailed on the Goods Returns Form.
Once the goods have been checked back into our warehouse we will arrange for the credit/debit card that you used for your original purchase to be refunded. Please allow fourteen days for the refund to be processed. Any items that have been ordered specially are excluded from this guarantee, as are any goods that are delivered ex-works such as sewage treatment plants or rainwater harvesting systems.
Read our returns policy for further details.
Our Returns Policy For Cast Iron Products From Hargreaves Foundry Products
If you wish to return any of our Cast Iron products, then please contact us as soon as possible. We can then liaise with the manufacturer and issue a returns form which will need to be returned to Hargreaves alongside the products. Our cast iron products come direct from Hargreaves Foundry (HF) in Halifax so returns will need to go directly back to them.
All return requests must be notified within 90 days of the goods being dispatched from HF and all damaged items must be notified within 24 hours of receipt of goods. All items must be returned in a saleable condition. Once agreed, the goods must be returned within 14 days from the date stated on the Return Form.
Please note that any bespoke items or specially painted RAL coloured items or Mech 416 Soil System pipes are non-returnable. Please be aware that all returns for Cast Iron Gutters and Soil & Drainage will incur a re-stocking charge of between 25% & 30% for exact details please view our Hargreaves returns policy.
The % charged is based on the net selling price of the original goods - this charge is unfortunately out of our control as it is levied on us by the manufacturer.
For full terms and conditions related to cast iron returns please consult our Hargreaves returns policy.