Product Overview
Reliable custom rubber parts for industrial applications
Quick Answer
Rubber preshaped hoses are molded or formed to specific angles and paths, helping connect components where straight hoses cannot fit or may interfere with surrounding parts.
EPDM Preshaped Condensate Hose — Acid-Resistant Formed Drain Hoses for HVAC, Boiler & Condensing Appliance Applications
Product Overview
This EPDM preshaped condensate hose is a molded rubber hose designed for routed drainage, ventilation, or low-pressure fluid return applications. The drawing shows a shaped hose body with a branch connection, defined connector ends, molded sealing grooves, and raised part identification marking.
The hose is designed to follow a fixed installation path instead of being forced into position during assembly. Its molded geometry helps maintain connector alignment, reduce installation stress, and provide stable fit in compact equipment layouts. The material specified on the drawing is EPDM 65 Shore A, with dimensional tolerances according to DIN ISO 3302 M2.
What Are EPDM Preshaped Condensate Hoses?
EPDM preshaped condensate hoses are molded rubber hose components used where drainage or ventilation lines must follow a specific route inside equipment. Compared with straight rubber tubing, a preshaped hose can include fixed bends, branch ports, connector grooves, sealing lips, and installation markings.
This type of hose is commonly selected when the hose must connect several points within a limited space while maintaining repeatable assembly position. EPDM rubber is suitable for water, condensate, weathering, ozone, and aging resistance, making it a practical material for condensate and non-oil drainage applications.
Key Technical Specifications
| Parameter | Drawing-Based Value |
|---|---|
| Product Type | Preshaped condensate hose / molded branched rubber hose |
| Drawing Reference | custom |
| Material | EPDM rubber |
| Hardness | 65 Shore A |
| Dimensional Tolerance | DIN ISO 3302 M2 |
| Main Structure | Branched molded hose with one main hose path and one vertical branch connector |
| Main Hose Bore | Approx. 20 mm reference bore at connector section |
| Internal Straight Length | 140 mm inside length shown on main hose section |
| Branch Connector Outer Diameter | 33 mm |
| Branch Connector Inner Diameter | 29 ± 0.2 mm |
| Branch Connector Height | 16 mm |
| End Connector Maximum Diameter | 30 mm |
| End Connector Fit Diameters | 27.6 mm, 26 ± 0.2 mm, 22.6 ± 0.2 mm, 20.4 ± 0.2 mm, 19.4 ± 0.2 mm, 16 mm |
| Angular Reference | 158.1° main hose bend reference; 33° branch angle reference; 9.8° end orientation reference |
| Marking Requirement | Raised part marking, 2-3 mm character size, 0.1-0.15 mm raised height |
| Drawing Scale | 1:2 general view; detailed sections shown at 1:1 and 2:1 |
Drawing-Derived Dimension Details
| Area | Dimension / Feature | Value From Drawing |
|---|---|---|
| Main Hose Path | Inside straight section length | 140 mm inside reference |
| Main Hose Path | Centerline / projected distance reference | 82.3 mm shown from end area to branch center reference |
| Main Hose Path | Overall reference dimensions | 92 mm and 105.7 mm shown as reference dimensions |
| Main Hose Path | Main bend angle | 158.1° |
| Branch Area | Branch connector outside diameter | 33 mm |
| Branch Area | Branch connector inside diameter | 29 ± 0.2 mm |
| Branch Area | Branch bore reference | 20 mm |
| Branch Area | Branch connector height | 16 mm |
| Branch Area | Branch angle reference | 33° |
| End Connector X | Outer diameter levels | 30 mm, 27.6 mm, 26 ± 0.2 mm |
| End Connector X | Intermediate fit diameters | 22.6 ± 0.2 mm, 20.4 ± 0.2 mm, 19.4 ± 0.2 mm |
| End Connector X | Inner bore / reduced bore reference | 20 mm and 16 mm shown in section |
| End Connector X | Axial step references | 2.5 mm, 4 mm, 4.3 mm, 9.5 mm, 15 mm, 17 mm |
| End Connector X | Chamfer and radius details | 1 × 45°, 45°, R0.5, R0.75, R1, R2.5 |
| Branch Connector Y | Outer diameter | 33 mm |
| Branch Connector Y | Inner diameter | 29 ± 0.2 mm |
| Branch Connector Y | Lower bore reference | 20 mm |
| Branch Connector Y | Height and chamfer | 16 mm height, 1 × 45° chamfer |
| Branch Connector Y | Radius details | R2 and R3 shown on connector profile |
| Marking | Part identification marking | Raised marking, 2-3 mm font size, 0.1-0.15 mm raised height |
Types of EPDM Preshaped Condensate Hose
Straight Condensate Drain Hose
Simple straight-run EPDM drain tubes with barbed or plain-cut ends for connecting the condensate drain outlet of an air handler, heat pump indoor unit, or condensing boiler to a drain point. Available in continuous lengths or cut-to-length.
Preshaped Multi-Bend Condensate Hose
Fully molded 3D geometry hose matching the exact internal routing of a specific appliance model — routing the drain from the heat exchanger, through the chassis, and to the drain outlet in a single component. Eliminates multiple straight sections and elbow fittings, reducing joint count and leak risk.
Convoluted Condensate Hose
EPDM hose with molded corrugated (convoluted) wall sections that provide a built-in flex zone — allowing the hose to bend and conform to the appliance structure without kinking or requiring tight-radius fittings. The smooth inner bore of the convolutions prevents condensate pooling and bacterial growth.
U-Trap / Condensate Trap Hose
Preshaped U-bend geometry forming an integral condensate trap — preventing backflow of flue gases through the drain circuit in positive-pressure condensing appliance installations.
Elbow Condensate Connector
45° or 90° preshaped EPDM elbow sections for routing condensate drainage around obstacles within appliance cabinets or between the appliance and floor drain.
Combination Smooth + Convoluted Hose
Premium design combining rigid smooth-bore sections at the connection ends (for clamp/barb retention) with a central convoluted flex zone — used where installation geometry requires one flexible mid-section and two dimensionally precise end connections.
Material Selection Guide
| Material | Key Properties | Typical Use Logic | Points to Confirm |
|---|---|---|---|
| EPDM 65 Shore A | Good water, condensate, ozone, weathering, and aging resistance | Specified material for this drawing-based condensate hose | Oil, fuel, or grease exposure should be avoided or reviewed separately |
| Custom EPDM Compound | Adjusted hardness, flexibility, or heat aging performance | Used when the application needs modified sealing force or durability | Working temperature, medium, and installation stress should be confirmed |
| Alternative Rubber Compound | Can be reviewed if the medium differs from condensate or water | Used only when the original EPDM material is not suitable for the working media | Drawing update and material approval may be required |
Why EPDM Is the Industry-Standard Material for Condensate Hoses
EPDM replaced Neoprene and Nitrile as the preferred condensate drain hose material for three decisive engineering reasons:
- Acid resistance — flue gas condensate from high-efficiency furnaces and condensing boilers is highly acidic, containing carbonic, nitric, and sulfurous acids at pH 2.5–4.5. EPDM withstands prolonged contact with these acids without softening, swelling, or degrading — NBR and CR decompose under the same conditions
- Ozone and weathering resistance — HVAC components are continuously exposed to ozone generated by electrical components within the appliance cabinet. EPDM’s saturated backbone is inherently ozone-resistant; NBR and SBR crack rapidly under ozone attack
- Heat and thermal cycling resistance — condensing furnaces and boilers expose drain hoses to repeated heating and cooling cycles. EPDM maintains physical integrity across -40°C to +150°C without hardening, cracking, or losing flexibility
- Process efficiency — EPDM is highly amenable to molding, forming, and extrusion. Convoluted wall sections can be molded directly into the hose geometry, allowing the drain tube to bend and conform to the exact interior structure of the appliance without additional fittings
- Cost advantage — EPDM delivers superior performance to Neoprene in condensate service at lower material cost — a decisive factor for high-volume appliance OEM programs
EPDM vs. Alternative Materials for Condensate Service
Key Application Areas
EPDM preshaped condensate hoses are specified across all condensing appliance and HVAC equipment categories:
Heat recovery ventilation (HRV/ERV) units — drain condensate from heat exchanger cores
High-efficiency condensing gas furnaces — drain condensate from secondary heat exchanger; primary OEM application driving EPDM adoption
Condensing boilers — drain acidic flue gas condensate from boiler heat exchanger and flue system
Air conditioning & heat pump indoor units — drain dehumidification condensate from evaporator coil drain pan
Commercial AHUs & fan coil units — large-bore condensate drain connections from multi-coil air handlers
Condensing water heaters — drain condensate from flue/heat exchanger in high-efficiency hot water systems
Refrigeration defrost drain lines — drain defrost water from refrigerated display cases and cold rooms
Dehumidifiers — drain hoses for residential and commercial dehumidification equipment
Customization Capabilities
Julong Rubber engineers EPDM condensate hoses to exact OEM appliance specifications:
Compliance documentation — UL/CE appliance component data, RoHS/REACH declarations, material data sheets on request
3D geometry — complex multi-bend preshaped routing matched to appliance chassis drawings; reverse-engineered from physical samples
Convoluted zones — molded corrugated flex sections at any position along the hose length, enabling bend compliance within tight appliance interiors
End fittings — barbed push-fit nipples (8–50 mm), bead-rolled ends for clamp retention, plain cut, or integrated quick-connect collars
U-trap geometry — integral condensate traps preshaped for positive-pressure appliance drain circuits
Bore sizing — ID from 8 mm to 50 mm; single-diameter or reducer transitions within one hose
Compound optimization — EPDM hardness, compression set, and low-temperature flexibility tuned per OEM specification
Color — black standard; grey or white available for appliance interior aesthetics
Why Source from Julong Rubber?
✅ English-speaking technical team — RFQ response within 24 hours
✅ ISO 9001:2015 certified manufacturing and QC processes
✅ In-house EPDM compounding — acid-resistant grades optimized for condensate service
✅ In-house mandrel and mold tooling — 7–15 day tooling for new preshaped geometries
✅ Convoluted wall molding capability — flex zones integrated into preshaped geometry
✅ Reverse engineering from physical sample — no drawing required for development start
✅ Low MOQ — 100 pcs standard; 5–20 pcs first-article/prototype quantities
✅ RoHS / REACH / appliance compliance documentation on request
✅ DDP/DAP global shipping — Europe, North America, Middle East
✅ 25+ years HVAC and appliance rubber component supply to global OEM markets
How to Order / Request a Quote
To prepare an accurate quotation, please provide the drawing reference, sample, or full dimensional drawing of the preshaped condensate hose. Important information includes main hose length, branch position, connector diameters, groove details, wall thickness, material hardness, and tolerance requirements.
For this drawing-based hose, the key production details include EPDM 65 Shore A material, DIN ISO 3302 M2 tolerance class, raised part marking, branch connector dimensions, and the molded main hose routing geometry. Please also confirm the working medium, operating temperature, required quantity, inspection requirement, and packaging preference.
FAQ
▼ Can you produce this preshaped condensate hose based on the drawing?
Yes. The hose can be produced according to the drawing-defined molded shape, EPDM 65 Shore A material requirement, connector dimensions, tolerance class, and raised marking requirement.
▼ What material is specified for this hose?
The drawing specifies EPDM rubber with 65 Shore A hardness. This material is suitable for condensate, water, ozone, and weathering resistance, but oil or fuel exposure should be reviewed separately.
▼ Can the connector diameters and grooves be inspected during production?
Yes. The drawing includes detailed connector diameters, groove geometry, chamfers, radii, and tolerance references, which can be used for dimensional inspection during production.
▼ Can the raised marking be customized?
Yes. The drawing specifies raised marking with 2-3 mm character size and 0.1-0.15 mm raised height. Marking content and position can be adjusted if a new drawing version requires it.
Request a Custom Quote
If you need an EPDM preshaped condensate hose with drawing-based dimensions, molded branch connection, connector grooves, and raised identification marking, you can send the drawing, sample, or application details for review. The material, mold design, inspection standard, and production method can then be matched to the actual assembly requirements.
