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PPR Reducing Socket Pipe Fitting

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  • PPR Reducing Socket Pipe Fitting
PPR Reducing Socket Pipe Fitting

PPR Reducing Socket Pipe Fitting

PPR Reducing Socket Pipe Fitting, also known as a reducer coupling, joins two PPR pipes of different outer diameters into a single straight, fused connection. As a piping network moves from a larger-diameter main line down to smaller branch lines, something has to manage that change in diameter — which is the role this fitting plays.
The reducing socket fitting typically uses the same heat-fusion welding process as an equal socket coupling, but with two sockets sized differently to match each connecting pipe. The internal transition between the two diameters is usually molded as a tapered profile rather than an abrupt step, which is generally intended to reduce turbulence at the point of size change compared to a poorly shaped transition.
This type of fitting is useful for system designers because it allows a main trunk line to be sized for overall system flow, then stepped down through reducing sockets as the network branches toward individual outlets, rather than running a single large diameter further than necessary. Reducing sockets are usually offered across a range of size-pair combinations; the specific combinations available should be confirmed with the supplier for a given project.

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Application Scenarios & Installation

The reducing socket fitting is used at every point in a plumbing or industrial piping network where the pipe diameter needs to step down without changing direction. In residential and multi-unit buildings, it typically appears where a large-diameter main riser transitions into the smaller branch lines that feed individual bathrooms, kitchens, or apartments, allowing installers to right-size each segment of the system for its actual flow requirement rather than running the largest pipe diameter unnecessarily far into the building.
In commercial and industrial piping — including HVAC chilled/hot water loops, water treatment facilities and process piping — reducing sockets are used to connect trunk distribution mains to smaller equipment-feed lines, ensuring each piece of downstream equipment receives an appropriately sized connection without requiring a separate transition adapter. The fitting is equally useful in agricultural and irrigation piping, where a main supply line often needs to be reduced in diameter as it moves further from the pump or water source and flow requirements per section decrease. Because the fitting is offered across a broad matrix of size combinations, plumbing wholesalers and contractors can stock a compact but comprehensive set of reducers to cover nearly any diameter transition encountered on a job site, without needing custom-fabricated parts.


NAME SIZE Gram weight RMB（UP） PCS/CTN Box gauge
REDUCE SOCKET S25*20 16 0.192 1000 47*29*40
S32*20 21 0.252 630 47*29*40
S32*25 24 0.288 540 47*29*40
S40*20 34 0.408 450 47*29*40
S40*25 32 0.384 400 47*29*40
S40*32 35 0.42 360 47*29*40
S50*20 50 0.6 320 47*29*40
S50*25 51 0.612 300 47*29*40
S50*32 53 0.636 250 47*29*40
S50*40 55 0.66 200 47*29*40
S63*20 89 1.068 180 47*29*40
S63*25 86 1.032 150 47*29*40
S63*32 86 1.032 150 47*29*40
S63*40 91 1.092 120 47*29*40
S63*50 98 1.176 120 47*29*40
S75*20 112 1.344 150 47*29*40
S75*25 112 1.344 130 47*29*40
S75*32 112 1.344 100 47*29*40
S75*40 117 1.404 85 47*29*40
S75*50 123 1.476 85 47*29*40
S75*63 131 1.572 65 47*29*40
S90*20 170 2.04 70 47*29*40
S90*25 180 2.16 70 47*29*40
S90*32 183 2.196 65 47*29*40
S90*40 185 2.22 48 47*29*40
S90*50 189 2.268 48 47*29*40
S90*63 201 2.412 48 47*29*40
S90*75 212 2.544 32 47*29*40
S110*20 297 3.564 35 47*29*40
S110*25 295 3.54 35 47*29*40
S110*32 292 3.504 35 47*29*40
S110*40 297 3.564 32 47*29*40
S110*50 300 3.6 32 47*29*40
S110*63 316 3.792 32 47*29*40
S110*75 338 4.056 32 47*29*40
S110*90 357 4.284 21 47*29*40
S160*63 905 13.575 35 47*29*40
S160*75 950 14.25 35 47*29*40
S160*90 910 13.65 30 47*29*40
S160*110 1075 16.125 30 47*29*40

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