Plan codes

[Scoot]

I don't know if anyone can help but I'm currently pricing off of a drawing (most jobs I do I design myself) I'm just trying to work out what the drainage codes SPIC 1/1, SPIC 1/2 and SPK8 are for? i can't seem to find any information anywhere on them, if anyone can point me in the right direction it would be much appreciated. 

[Roundtuit]

Google suggests that they might be Hepworth product codes.

[Scoot]

Thank you for that Roundtuit, no wonder I was struggling to find anything the drawing states PVC pipe yet them chambers are for clay from what I could see.

[PeterW]

SP1 is Hepworth 100mm supersleve clay pipe - not unusual to still see it specced as it it used in roadways and pavements. Could find it’s been specced to be adopted or connected to existing clay.