Tubing
There are two common methods used to install PEX for plumbing.
The first is to install PEX pipe just like you would copper. Using this method, you can run two mains; one hot, one cold, and use a fitting for every hookup.
The second method is called a home run system. Using this method, you run a dedicated pipe to every fixture from a manifold, which has multiple ports to tie the water lines into. This method has a couple of advantages; There are fewer fittings and less purge time on the hot water lines to a fixture. This means there is less water wasted while waiting for your water to get hot.
PEX tubing is also the the material of choice for hydronic heating systems, including radiant in-floor heating. NOTE; If using PEX for a closed loop heating application, make sure that your PEX has an oxygen barrier in it.
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 1 2 x 300ft PEX Tubing O2 Oxygen Barrier Radiant Heat  US $85.95
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 1 2 x1000ft O2 barrier red pex tubing nsf upc astm US $250.00
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 1 2 x 1000 Pex Tubing Oxygen Barrier Radiant Heat Piping System NSF ASTM US $244.99
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 2 rolls 1 2 x 500ft PEX Tubing for Potable Water Combo US $225.00
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 500 3 4 Uponor Wirsbo HePex Pex tubing radiant snowmelt 500 foot roll hydronic US $295.00
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 1 2 500 RED OR BLUE PEX POTABLE WATER TUBING US $99.99
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 1000 PexWORX 1 2 Radiant Heat Oxygen Barrier Pex Tubing Outdoor Wood Boiler US $242.10
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 1 2 x500ft O2 barrier red pex tubing nsf upc astm US $125.00
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 5 8 x 1000ft PEX Tubing O2 Oxygen Barrier Radiant Heat US $340.00
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 3 8 x 1000ft PEX Tubing O2 Oxygen Barrier Radiant Heat US $240.00
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 2 rolls 1 2 x 100ft PEX Tubing for Potable Water Combo US $63.00
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 3 4 x 300ft PEX Tubing Oxygen Barrier for Radiant Heat US $141.00
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 2 3 4 x 300ft PEX Tubing O2 Barrier for Radiant Heat US $275.00
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 3 4 x 100 Red Oxygen Barrier Radiant Heat Pex Tubing Piping System NSF ASTM US $67.99
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 3 4 x 100ft PEX Tubing for Potable Water FREE SHIPPING US $50.00
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 2 1 x 300ft PEX Tubing Outdoor Wood Boiler Furnace US $430.00
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 2 rolls 3 4 x 100ft PEX Tubing for Potable Water Combo US $90.00
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 RED 1 2 x 1000 ft PEX Potable Water Tubing Pipe Tube US $214.00
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 2 Rolls of 320 640 3 4 PEX AL PEX Tubing Oxygen Barrier Radiant Floor Heat US $279.95
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 2 rolls 1 2 x 300 ft PEX Tubing Plumbing Pipe Drinking Potable Water NEW Combo US $138.00
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