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			<title>Green Building Forum - waste pipe cap?</title>
			<lastBuildDate>Thu, 30 Apr 2026 20:16:33 +0100</lastBuildDate>
			<link>https://www.greenbuildingforum.co.uk/newforum/</link>
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		<title>waste pipe cap?</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18321&amp;Focus=308845#Comment_308845</link>
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		<pubDate>Sun, 20 Jul 2025 16:42:07 +0100</pubDate>
		<author>djh</author>
		<description>
			<![CDATA[I need to cap a waste pipe, temporarily. We're replacing the flooring in our kitchen and I've disconnected the dishwasher and want to cap the trap so we can still use the sink.<br /><br />Under the sink there's normal 40mm plastic waste fittings and the dishwasher screws onto an 'appliance trap' connection <a href="https://mcalpineplumbing.com/traps/domestic-appliance-traps-accessories/sink-trap-with-domestic-appliance-inlet/" target="_self" rel="nofollow">https://mcalpineplumbing.com/traps/domestic-appliance-traps-accessories/sink-trap-with-domestic-appliance-inlet/</a> I've unscrewed the fitting and removed the whole fitting on the left of the photo. I need a blanking cap that can be screwed on in place of that screw cap but I'm not sure what to buy? I bought a McAlpine T23U Multifit Blanking Plug White 40mm but that seems to be designed to fit onto a plain 40mm pipe, not onto a 40mm pipe with a male threaded end.<br /><br />I'm curious if there's a cap that's designed to screw on in this situation, or do I just need a short length of plain 40mm pipe?]]>
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		<title>waste pipe cap?</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18321&amp;Focus=308846#Comment_308846</link>
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		<pubDate>Sun, 20 Jul 2025 18:49:21 +0100</pubDate>
		<author>LF</author>
		<description>
			<![CDATA[Pretty sure I have made them in the past from cutting a disk in something flat.<br /><br />Just worked on 40mm and push fit, screwed and solvent weld were all different diameters]]>
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		<title>waste pipe cap?</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18321&amp;Focus=308847#Comment_308847</link>
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		<pubDate>Sun, 20 Jul 2025 19:28:44 +0100</pubDate>
		<author>Jonti</author>
		<description>
			<![CDATA[Bit of clingfilm over the end and plenty of duct tape. There is not going to be any pressure on it so no need for anything else.]]>
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		<title>waste pipe cap?</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18321&amp;Focus=308848#Comment_308848</link>
		<guid isPermaLink="false">https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18321&amp;Focus=308848#Comment_308848</guid>
		<pubDate>Sun, 20 Jul 2025 19:30:42 +0100</pubDate>
		<author>philedge</author>
		<description>
			<![CDATA[You can buy expanding bungs for 1 1/4 and 1 1/2 waste]]>
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		<title>waste pipe cap?</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18321&amp;Focus=308850#Comment_308850</link>
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		<pubDate>Sun, 20 Jul 2025 21:20:41 +0100</pubDate>
		<author>djh</author>
		<description>
			<![CDATA[Thanks all. I went with a short length of pipe that I happened to find lying around :)]]>
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	<item>
		<title>waste pipe cap?</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18321&amp;Focus=308851#Comment_308851</link>
		<guid isPermaLink="false">https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18321&amp;Focus=308851#Comment_308851</guid>
		<pubDate>Sun, 20 Jul 2025 21:47:46 +0100</pubDate>
		<author>WillInAberdeen</author>
		<description>
			<![CDATA[<a href="https://mcalpineplumbing.com/plastic-chrome-fittings/sundry-fittings-bsp-couplings/blank-cap/" target="_self" rel="nofollow">https://mcalpineplumbing.com/plastic-chrome-fittings/sundry-fittings-bsp-couplings/blank-cap/</a> if anyone else is looking!<br /><br />I kept the one that came with a trap I bought two houses ago]]>
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