Manthorpe GRS-DUO-15 – Radiator Pipe Guide & Seal – 15mm

The Manthorpe GRS-DUO-15 is a purpose-made 15mm radiator pipe guide and seal, designed to sort out one of those details that can cause genuine problems if it’s rushed or bodged. Behind a radiator, where 15mm flexible plastic barrier pipe exits the wall and curves down towards the valve points, you’ve got two potential issues: air leaking through the penetration and the pipe kinking or chafing along that short exposed run. This product addresses both at once, and does it properly.

The system uses a twin-plate design. At first fix, the rear mount plate goes in at the point where the pipe exits the wall, anchoring it at the correct position and providing a fixing point that works with both blockwork and stud wall construction. The guide channels built into the plate support the pipe as it curves towards the valve corners, removing the risk of kinks in the flexible barrier pipe before plasterboard is even up.

How the Manthorpe Radiator Pipe Guide Works at Second Fix

Once the plasterboard is on and the room is being finished, the cover plate fits over the opening. Here’s where the design earns its keep: the cover plate fixes with a single central screw, and that screw goes into the mount plate rather than into the plasterboard itself. If you’ve ever tried to get a decent fixing close to a cut edge in plasterboard, you’ll appreciate why that matters. No crumbling edges, no dubious fixings, no mess.

The flexible grommets seal around the pipe, closing off air leakage through the penetration while still allowing some directional adjustment. Multiple pilot hole positions between the two plates mean the system can accommodate different plasterboard thicknesses and radiator offsets without fuss. The result is a clean, finished detail that’s airtight and properly supported. It’s the kind of fitting that gets overlooked until you’ve seen what a gap around a heating pipe can do to an air pressure test.