Does this fit into a 4" clay pipe as it is slightly smaller than 4" plastic?

Yes,mine is fitted into a clay pipe. You need to squeeze it so that it goes into the pipe - then it expands when you release it to make a tight fit.

How does this fit in the pipe?

Very simple and effective; the guard is in fact a slightly oversize 4 inch diameter tube with a broad slot down it's length. - To fit it into a 4inch diameter sewage pipe you simply need to squeeze the tube to reduce its diameter, then push it into the drain pipe and, as soon as you release it, it springs back to make a tight fit in the pipe. - Takes a bit of strength to squeeze the tube down to size,but I managed it without too much hassle. When you do this, it's important to lift the hinged flap up out of the way. Hope this helps.

Will the guard prevent rubble from the pipes from getting through? I am worried it will get blocked up and cause flooding

It is on a hinge that opens to allow waste to flow out to main drains and stays closed to prevent anything like rats coming up from the main drains. I would have thought that rubble will block your drains anyway, regardless of whether you have the guard fitted or not.

I have had rats chew thru flexi pan connectors, which link the WC to waste pipe. Can these be inserted into waste, to stop rats getting at flexi pipe?

Not sure, but we connected it to a defunct pipe which lead into our house and this stopped all infestation... not sure if this answers your question.

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Roshield Rat Drain Guard | Stop Rats within Drainage & Properties | Rodent Flap Control & Prevention Proofing (Stainless Steel 6"/150mm)

Product ID: 230999291

🔧Tool-free, easy installation

🚫One-way rat-proof flap

🛡️316 marine-grade stainless steel

HK$1046

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Description

🚫 Keep Rats Out, Peace of Mind In!

TRUSTED BY PROFESSIONALS - Used widely in pest control industry, ensuring proven, reliable rodent prevention.
SMART ONE WAY RAT BARRIER - Innovative flap design lets waste flow freely while blocking rats from invading your property.
EFFORTLESS DIY INSTALLATION - No expertise needed—install quickly with included hardware and switch flow direction in seconds.
TAILORED FIT FOR YOUR DRAINS - Available in 6" (150mm) size with clear instructions, plus expert support and video guidance.
UNYIELDING STAINLESS STEEL DEFENSE - Crafted from premium 316 marine-grade stainless steel for ultimate corrosion resistance in damp drain environments.

The Roshield Rat Drain Guard is a UK-made, 316 stainless steel drain protector designed to block rats from entering properties via drainage systems. Featuring a one-way flap that allows waste to pass but prevents rodent ingress, it installs easily without professional help. Trusted by pest control pros, this 6" (150mm) drain guard offers durable, maintenance-free protection against infestations.

Specifications

ASIN	B08D3TYBF9
Best Sellers Rank	13,288 in Garden ( See Top 100 in Garden ) 338 in Rodent Control
Customer Reviews	4.1 4.1 out of 5 stars (38)
Date First Available	16 July 2020
Guaranteed software updates until	unknown
Item model number	RDG6
Manufacturer	Fort Products Limited
Package Dimensions	18.3 x 17.9 x 13.4 cm; 927 g
Part number	RDG6

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HK$1046

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