There is a reason why plumbing threads are considered integral pieces of pipe fitting equipment; they offer a secure connection of pipes waiting for the delivery of water and gas without a leak. 

Knowing about different types of plumbing threads, how they are used, and some practical tips can help homeowners and DIYers pick more intelligently while dealing with plumbing issues using their hands. 

National Pipe Thread

The National Pipe thread is NPT, which applies mostly in North America. Tapered is increasing in diameter through the pipe. This allows a tighter seal when the fitting is tightened, which is good for high-pressure applications. 

Water, gas, and air systems tend to use NPT mostly by using pipe threading taps to achieve the best precision possible.

British Standard Pipe

British Standard Pipe (BSP) threads are common throughout Europe, and in many other parts of the world. Available in both tapered and parallel versions, BSP threads are the same as NPT but use different measurements and thread angles. 

Sealing BSPT (British Standard Pipe Tapered) uses seals, whereas BSPP (British Standard Pipe Parallel) does not require sealing since it’s in mechanical applications. 

Compression Threads

For many residential plumbing water connections, compression threads are common, normally on pipes that must be disconnected and reconnected frequently. They use a compression ring by tightening the nut to create a watertight seal. 

Compression fittings are more typically used in situations where fixtures like faucets, shut-off valves, etc., will have access for maintenance. They are easy to install and need no additional sealant, making them a DIY-friendly project.

Flare Threads

Because they are leakproof, these flare threads are used in gas and refrigeration systems. The flared edge is tightened to make a seal without the use of Teflon tape or any other sealant. 

Because flare fittings are resistant to vibration and even to high pressure, they are utilized with copper tubing in gas lines, air conditioning systems, and fuel systems. 

Garden Hose Threads (GHT)

Garden hoses have their particular Garden Hose Threads or GHT. These are straight rather than tapered, and a washer must be used along with them to seal properly. 

You can tell GHT fittings by their larger diameter and wider threads. They are mostly used where low pressure is required for outdoor application in connecting hoses to faucets and sprinklers.

Conclusion

The different plumbing threads and how they are used must be understood to ensure secure and leak-free plumbing connections for any project. 

Each is different – from NPT to BSP to garden hose threads down to which to choose can save time and trouble. By reading this short article, homeowners and DIYers can undertake plumbing projects with the correct threads and tools.