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Do It Yourself
Plumbing
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Home & Garden
Do It Yourself
Plumbing
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Sealing pipe joints, connections, sinks,
Replacing shut off valves: A 1/4 turn ball valve is better than the old types of compression valve. See How To Replace A Leaking Water Shut Off 1/4 turn Ball Valve Angle Stop - YouTube
Over tightening can split the female connection because of the taper. Kitchen Sink Drain Flange (Strainer Basket) at the bottom of a sink. Use plumber's putty, a LOT more of it than you think you need. Roll it into a tube, put it around the hole, overlapping the ends, then press down the drain flange. A lot of excess putty will squirt out both the top and bottom, but it does not matter. There is no wait time after the putty has been compressed and should stay flexible for many years.
Some people prefer silicone between the sink and basket rather than
Plumber's putty. Terms: ABS - Acrylonitrile-Butadiene-Styrene Used in mobile home and residential drainage systems to provide gas service. ASTM - American Society for Testing and Materials BSPP British Standard Pipe Thread Parallel BSPT British Standard Pipe Thread Tapered CPVC - Chlorinated Polyvinyl Chloride Pipe with excellent chemical, crush and fire resistance. High impact. FIP - Female Iron Pipe (NPT) FPT - Female Pipe Thread (same as FIP) IPT - Iron Pipe Thread IPS - Iron Pipe Size (old system) IPS - Iron Pipe Straight Thread - Generic Name for Straight Pipe Thread (NPSH) IPS - Pipe from IPS Corporation MHT - Male Hose Thread MIP - Male Iron Pipe MPT - Male Pipe Thread MIPS - Male Iron Pipe size MPT - Male Pipe Thread NPT - National Pipe Tapered Thread - American Standard Pipe Taper Thread 
Tapered threads are deeper at the end of the pipe and are increasingly shallower the further they are from the end of the pipe. The taper on the pipe only allows the pipe to screw inside the fitting until it is forced to stop because of the taper. After tightening with a wrench the threads may have slight spaces between the pipe and fitting which could cause a leak so a pipe sealant should be used to ensure any gaps are filled.
NPTF - National Pipe Thread Fuel NPTF threads are designed so that when the threads are mated, they actually deform to create a mechanical seal. Since the seal is created by the threads themselves, a thread seal agent is not required (though may be used as a lubricant).
NPS - National Pipe Straight
PTFE - Teflon (polytetrafluoroethylene)
See Also:
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