This is a Double Socket Underground Coupler with a diameter of 160mm made by Polypipe.
Price: £19.26 from Plumbing Place
Polypipe 45 Double Socket Junction, Polypipe's below ground range of drainage carry all the approvals and accreditations needed and offer strength and flexibility making them a great alternative to clay drainage and concrete drainage, with a huge range...
Polypipe PVC Double Socket 160mm, Polypipe's below ground range of drainage carry all the approvals and accreditations needed and offer strength and flexibility making them a great alternative to clay drainage and concrete drainage.
This is the Double Socket Bend 45 Degrees 160mm from Polypipe