"Perfectly good quality product, Made the mistake of getting a standard gully riser but they are too large for the bottle gullies. This one is the right size and Screwfix seem to be one of the few places that actually stock it."
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Review 4 for FloPlast Riser For Back Inlet Gully 200mm
"This product is a piece of tube with one end expanded to receive the top section of a bottle gully. There are no ring seals on this item so the gully top sits loosly and stays in place by gravity. I think the description "Easily installed by a push-fit joint through an innovatively designed seal and snap-cap system" was cut and pasted from another product. This is nothing of the kind."