Sliding fittings have minimal flow restriction
PEX Sliding Fittings have a smooth internal bore. The pipe is not significantly restricted. Flow rate is nearly identical to the pipe itself. Example: a 1/2-inch fitting has negligible pressure drop.
Internal geometry comparison
The sliding fitting has a smooth interior. The pipe passes through without obstruction. Other fittings may have internal restrictions. PEX Sliding Fittings offer smooth flow.
Crimp fitting flow restriction
Crimp fittings have a barb that slightly restricts flow. The pipe is compressed around the barb. This creates a small pressure drop. PEX Sliding Fittings have less internal restriction.
Push-fit fitting flow restriction
Push-fit fittings have internal teeth and O-rings. These create slight flow resistance. The restriction is minimal. PEX Sliding Fittings are similar.
Example: 1/2-inch fitting comparison
A sliding fitting has a 0.5 psi drop at 5 gpm. A crimp fitting has a similar drop. Both are negligible. PEX Sliding Fittings are efficient.
Example: 3/4-inch fitting comparison
A sliding fitting has a 0.3 psi drop at 10 gpm. A crimp fitting has a similar drop. Both are efficient. PEX Sliding Fittings are comparable.
Flow rate in long systems
Many fittings in a system increase total pressure drop. Each fitting adds a small loss. PEX Sliding Fittings contribute equally.
Design considerations
Designers must account for pressure drop. Fitting type has minimal impact. PEX Sliding Fittings are efficient.
Manufacturer data
Manufacturers provide pressure drop data. Check specifications for exact values. PEX Sliding Fittings data is available.
Optimizing flow
Use larger diameter pipes for higher flow. Minimize the number of fittings. PEX Sliding Fittings are efficient.
Final flow rate summary
PEX Sliding Fittings have minimal flow restriction. The smooth internal bore allows efficient flow. Crimp and push-fit fittings have similar flow characteristics. In most systems, the difference is negligible. PEX Sliding Fittings are efficient for all applications. Example: choose sliding fittings for smooth flow.