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A Seal.
The rajay range of turbo come with a carbon seal as standard. They are getting hard to come by now as production stopped in 2008
The most likely reason is that the water inlet is blocked. (It could also be that the water pressure is low, but that would show up in the sinks and every other faucet as well.) It might be blocked by mineral scale, or it might be that the inlet valve is partially closed. I agree with the above answer. I would like to add another cause for slow filling. The Fluidmaster 400A or 400 Series fill valves has a seal or disc that can swell after it has been in use for several years. The swelling of the seal restricts the flow. A swollen seal will slow the flow of water through the valve. You can replace the seal (# 242), sold at local hardware stores. The back of the seal package has the steps for replacing the seal.
it makes you slippery like a seal :D
Envelopes have a strange taste when you lick the seal because there is a layer of glue there. The glue is made from gum arabic. Gum arabic is produced with the sap of acacia trees.
Pipe joint compound or Teflon tape
Teflon is inert to gasoline and all petroleum products. The problem with Teflon is it cold flows under pressure so that when tightened (when wrapped around your fitting) it will relax eventually and probably not seal properly. This is not something you want where gasoline can leak.
PTFE stands for: Poly Tetra Fluoro Ethylene Much better known as Teflon. A PTFE seal is a Teflon seal.
A leak
In my experience it will leak.
A bit of teflon tape can work wonders.
Teflon paste and quick wick
AN fittings are a flare fitting, using 37° flared tubing to form a metal-metal seal.
There are a number of sealants available to prevent leaks in pipes. If you don't want to use teflon tape, you can use a liquid sealant which will form a seal as it dries.
Teflon tape is good. There is now a teflon liguid sealer also. The old pipe sealer is still good. I used a piece of radio solder last year to seal a water meter joint when I lost the meter seal. Be inventive.
yes
Flared fittings use a flare and a nipple for the sealing surface. The threads do not serve any purpose as to actually sealing anything. The threads merely hold the flare of the one fitting together tightly with the nipple of the other fitting to create a seal.