SharkBite push-to-connect fittings listed to ASSE 1061 approved for PEX-A, PEX-B and PEX-C pipe.
Cross-linking is defined as polyethylene material that has undergone a change in molecular structure using a chemical or a physical process whereby the polymer chains are chemically linked. SharkBite non oxygen barrier pipe is manufacture as PEX-B and SharkBite oxygen barrier pipe is manufactured as PEX-C.
There are two parts to this transition: the PEX-A MIP adapter and the PEX-B FIP adapter. These parts will thread together and allow you to join PEX-A to PEX-B. The PEX-A side will require an expansion ring while the PEX-B side requires the crimp ring.
Identify the pipe material.
SharkBite brass push-to-connect fittings are compatible with PEX, Copper, CPVC, PE-RT and SDR-9 HDPE pipe. SharkBite fittings come with a PEX stiffener pre-loaded into the fitting for PEX, PE-RT and SDR-9 HDPE. The PEX stiffener does not need to be removed for Copper or CPVC applications.
Bottom line, PEX A is more resistant to burst pressure than PEX B. PEX A's expansive material can handle up to 500 PSI, which makes it reliable in extremely cold temperatures. Since PEX B is a more rigid material, it will not hold up as well in similar situations.
Crimp fittings are compatible with all types of PEX tubing, except for PEX-AL-PEX. Crimp fittings are preferred for many applications since they are widely available and are the most affordable.
While you can use ASTM F1960 expansion fittings with PEX-b or PEX-c pipe, strength tests have shown the strongest connection is between PEX-a pipe and expansion fittings, due to the thermal and elastic memory of the PEX-a pipe.
Using stainless steel pinch clamps, also referred to as ear clamps, are a great way to connect PEX pipe to PEX fittings. Connections made using SS Pinch Clamps with an interlocking design provide the same high integrity connection as a copper crimp ring connection.
PEX-A is the most flexible of all PEX tubing types, has little or no coil memory and gives installer an ability to repair kinks with a heat gun. It has been in use for over 50 years (which is longer than other types) with few publicly known issues (3), which is a good indicator of reliability.
Color-Coded: Red PEX pipes can be used for hot water supply lines, blue PEX for cold water supply, and white for either hot or cold. These colors are just for your convenience. Plumbing code does not require the pipe color to match the type of water supply.
These are classified based on the way the are manufactured. Pex-A is the only type that Uponor manufactures and is considered to be the best. Apollo manufactures both Pex-A and Pex-B. If your supplier is selling Sharkbite fittings, all sharkbite fittings will work on all three types of Pex.
To support bare PEX, space hangers between 32 inches and 48 inches apart, depending on the applicable code.
Expansion PEX tubing is cross-linked, high-density polyethylene. It's available in white, red, or blue colors for easy identification of hot and cold water lines.
PEX pipe is made by a handful of companies, but the best version I've discovered so far is part of a system called ProPEX. It's a proprietary brand of PEX connections and pipe invented by an international company named Uponor (uponor.ca) and based in Finland.
As with any other pipes, PEX is not prone to leaking. Nearly all of the plumbing leaks occur at joints (connection spots) and most of them are due to incorrect installation. Much like installing PEX tubing, repairing it is also an easy process.
Apollo offers PEX-A (Expansion PEX) and PEX-B tubing. PEX-A tubing (Expansion PEX) is produced using the Peroxide or Engel method. Molecules of HDPE polymer are cross-linked during the extrusion process. PEX-B tubing is produced using the Silane or moisture-cured method.
While PEX crimp might be an ideal choice for your plumbing workload, PEX clamp device can be the better option. Usually, there are two main methods of connections in PEX installation; the crimp method and the cinching method. Others also include press or push connection, which eliminates the use of any tool whatsoever.
Most plumbing applications, especially those involving potable water, call for the use of non-oxygen barrier PEX, offered in several grades. PEX-A, which has the most flexible tubing and best freeze- and kink resistance, is ideal for use with kitchen and bath fixtures.
When and when not to use SharkBite fittings. Most professional plumbers believe that SharkBite fittings and other kinds of push-fit fittings should only be used as an emergency, temporary fix, and not for any enclosed or permanent plumbing system. However, there is a growing selection of DIYers who would disagree.
White PEX pipe can be used for either hot or cold water. Gray PEX pipe, like white, can be used for either hot or cold water (although not all DIY centers carry gray).
PEX pipes, just like any pipe, can freeze when the temperature drops too low. Because the pipes are designed to be flexible, PEX has the ability to expand. Although it is still possible for them to burst, this means PEX pipes are less likely to rupture after freezing.