Flexible Line Set Cover Joint for Mini Split AC Pipes Extendable Corrugated Connector

Product Description

Flexible Joint-LR

Definition: The LR Series is an extendable flexible joint designed for mini split line set cover systems. Its corrugated structure allows the cover to bend and adjust around irregular corners, offset pipe routes and installation obstacles. Three sizes are available for connection with compatible straight cover ducts, helping maintain a neat and continuous enclosure around insulated refrigerant pipes, drain hoses and control cables.

Specification

Application Scenarios:

Complex wall structures: Such as when encountering beams, columns, uneven walls (Uneven installations), or special spaces with non-90-degree corners.  

Long-distance spans: Used as flexible expansion joints when two sections of ductwork are far apart and it is inconvenient to install fixed bends.  

Indoor and outdoor environment transition: Commonly used at the connection between indoor and outdoor units of air conditioners, especially in areas that require wall penetration and slight angular offset.

Core Materials and Production Process

Core Material: Modified high weather-resistant polyvinyl chloride (UV-Stabilized PVC).  

High-performance UV stabilizers are added to ensure it does not yellow or become brittle under long-term sun exposure. 

Ribbed extrusion process: Provides excellent flexibility and pressure resistance to the pipe body.  

Precision injection-molded fittings: The fitting dimensions are accurate (compatible with 70mm, 76mm, 95mm systems), ensuring a secure fit with straight pipe channels (such as ZL series).

Manufacturing Advantages:

High Flexibility: Can be bent 360 degrees as needed, eliminating the need for frequent cutting of rigid pipes, significantly improving construction efficiency and reducing labor costs.  

• Strong Specification Adaptability: Offers multiple specifications including LR-1/2/3, with lengths extendable to around 500mm-580mm, covering installation needs from household split systems to commercial multi-split (VRF) systems.  

• Excellent Weather Resistance: Designed for extreme weather conditions, with a temperature range typically from -20℃ to +60℃, ensuring a long service life outdoors.  

• System Compatibility: As a full system accessory for air conditioning pipe channels, it maintains consistent color, material, inner diameter, and straight pipe height. 

Related Products

GG-Straight Duct

QG-Wall Cover

WJ-End Cap

Technical Specifications

(Custom configurations available upon request.)

Model	Dimension (mm)
	A	B	C	D	E
LR-1	30	55	70	500	/
LR-2	35	56	76	507	/
LR-3	54	64	95	578	/

Components & Specifications

GG-Straight Duct:Main body protection, length 2000mm, can be cut on site

QG-Wall Cover:Seals wall penetration holes, provides protection at the starting end

PW-90° Flat Elbow:90° horizontal (flat) turn along the wall

CW-90° Elbow:90° vertical (three-dimensional) turn

LR-Flexible Joint:Extendable length 500mm+, adapts to irregular curves or obstacles

ZL/ST-Coupling/T-type Joint:Straight extension or multi-branch connection

WJ-End Cap:End cap closure, prevents foreign objects from entering

Standard seaworthy package

Comparable Products

Criteria	LR Series Flexible Joint	Metal Flexible Conduit	Rigid Elbow
Installation Efficiency	High:The flexible corrugated structureadapts to offset routes and irregular bends,reducing the need for precise anglemeasurement.	Medium: Cutting, shaping or additionalfixing tools may be required, depending onthe conduit type.	Medium: Simple for standard 45° or 90° turns,but additional fittings may be required forcomplex routes.
Routing Flexibility	High: Suitable for irregular corners, offsetconnections and obstacle bypasses.	Medium to High: Flexible routing ispossible, but installation may be affected byconduit stiffness and minimum bending radlus.	Low: Limited to the fixed angle and direction ofthe selected fitting.
Length Adjustment	Adjustable: The corrugated structure canbe extended or compressed within itsspecified range.	Limited: Length normally requires cuttingor selecting another conduit size.	Not Adjustable: Additional straight sections or connectors are required.
Corrosion Resistance	High: Non-metallic construction does notrust and is suitable for general indoor andoutdoor installation.	Varies by Material: Galvanized steel mayrequire additional protection in humid orcoastal environments; stainless steelperforms better.	High: PVC construction does not rust and issuitable for general installation environments
System Appearance	High Consistency: Designed to coordinatewith compatible PVC straight ducts andfittings for a continuous appearance.	Different Appearance: The metallic finishmay not visually match a PVC line set coversystem.	High: PVC construction does not rust and issuitable for general installation environments.
Application Adaptability	High: Recommended where standardelbows cannot match the actual pipe route.	Medium: Suitable for exposed or industrial-style installations.	High Consistency: Matches compatible PVCstraight ducts when the correct series and colorare selected.
Maintenance Access	Convenient: The flexible connection canaccommodate minor routing changesduring installation or maintenance.	Medium: Removal and reinstallation mayrequire tools.	Convenient: Easy to replace when installed aspart of a modular cover system.
Best Suited For	Irregular bends, offset routes, obstacles and retrofit projects	Industrial or exposed conduit protection	Standard 45° and 90° pipe turns

FAQ

Q1: What is the LR Flexible Joint used for?

The LR Flexible Joint is designed for areas where rigid straight covers or fixed elbows cannot follow the pipe route. Its corrugated structure adapts to offset connections, irregular bends and installation obstacles.

Q2: Which straight duct is compatible with each LR model?

LR-1, LR-2 and LR-3 are designed for matching line set cover profiles. Please confirm the compatibility chart and actual duct dimensions before ordering.

Q3: Can the flexible joint be extended and cut?

The joint can be extended and compressed within its specified adjustment range. Whether it can be cut depends on the product structure and should be confirmed before installation.

Q4:  Can the LR Flexible Joint be used outdoors?

Outdoor suitability depends on the actual material formulation and UV performance. UV-stabilized specifications and relevant test reports can be provided according to order requirements.

Q5: Are the GG straight duct and other fittings included?

No. The listed price is for the LR Flexible Joint only unless otherwise specified. GG straight ducts, wall covers, elbows and couplers are compatible accessories and are quoted separately.

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