What is the internal and external diameter of the washer?

Dimensions are INTERNAL Dia 30mm EXTERIOR Dia 45mm they are waste washers for a basin pop up waste

The OD is 47mm which is the width of the top of the plug and the ID is 30mm. The intermediate step is 39mm. The bath waste is 42mm. Mine is 20 year old Ideal Standard Bath waste

Which way around do you fit an olive washer

Depends on plug but I bet the way they Shown in the picture that is the top side when the plug is fitted.On the bright side it’s 50-50

can it be used for a toilet cistern ( to replace a Beta valve washer)

Don't know for sure but if you've got old washer I would take it to b&q or somewhere to get a like for like replacement.

Oracstar Tank Connector Divertor Pop Up Waste Plug Washer Pack

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Sold byAmazon PanamaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

💧 Seal the deal with Oracstar – no leaks, no worries!

DUAL PACK VALUE - Two washers included for double the reliability and convenience
EASY DIY UPGRADE - Simple replacement that saves you from expensive plumbing overhauls
PERFECT 30 MM FIT - Engineered for seamless integration with standard basin plugs
LEAK STOP TECHNOLOGY - Effectively prevents slow water drainage and costly leaks
TRUSTED ORACSTAR QUALITY - Reliable, durable, and designed for professional-grade performance

The Oracstar Tank Connector/Divertor/Pop Up Waste Plug Washer Pack of 2 offers a precise 30mm fit designed to replace worn washers and stop slow leaks in basin plugholes. Lightweight and durable, this dual pack provides an affordable, easy-to-install solution trusted by professionals to maintain leak-proof plumbing without costly replacements.

Specifications

ASIN	B00LXM7TBW
Batteries Required?	No
Batteries included?	No
Best Sellers Rank	773,160 in DIY & Tools ( See Top 100 in DIY & Tools ) 901 in Tap & Valve Washers
Colour	Black
Customer Reviews	3.9 3.9 out of 5 stars (122)
Date First Available	31 July 2013
Guaranteed software updates until	unknown
Head Style	Round
Item Package Quantity	1
Item Weight	7 g
Item model number	PPW99
Manufacturer	Oracstar
Material	See description
Number of Pieces	2
Package Dimensions	12.7 x 8.1 x 0.4 cm; 7 g
Part Number	PPW99
Size	30mm

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