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When a leaking joint ruins a carefully built aquarium system or a pond pump loses pressure overnight, the culprit is almost always a substandard fitting. These grey PVC metric plumbing fittings are engineered for hobbyists, aquarists, and DIY builders who need a watertight, chemical-resistant connection they can trust — whether they're running a recirculating fish tank, a koi pond, or a garden irrigation loop.
Each fitting is manufactured from rigid grey PVC (polyvinyl chloride) and is designed for solvent-weld assembly, creating a permanent, leak-free bond when used with standard PVC solvent cement. The range covers seven fitting types — Straight Coupling, Reducing Connector, 90 Degree Elbow, and 3-Way, 4-Way, 5-Way, and 6-Way fittings — spanning metric diameters from 20 mm (approx. ¾ in) up to 160 mm (approx. 6¼ in). Wall thickness and socket depth scale with pipe diameter, typically 1.5–4 mm wall for the smaller sizes and 3–7 mm for the larger sizes.
Typical use cases include freshwater and saltwater aquarium sump plumbing, koi pond filtration return lines, DIY hydroponic nutrient delivery systems, and low-pressure garden water features — all applications where a solvent-weld grey PVC metric pipe fitting delivers long-term reliability without corrosion or metal contamination.
Choose from Straight Coupling, Reducing Connector, 90° Elbow, or 3/4/5/6-Way fittings — covering virtually every junction in a recirculating aquarium or pond plumbing layout.
Straight and elbow types run from 20 mm to 160 mm; reducing connectors cover cross-diameter pairs from 25×20 mm up to 160×125 mm — so you can step down flow paths without extra adapters.
Socket ends accept standard PVC solvent cement for a chemically fused, pressure-rated bond — no clamps, no O-rings to degrade, no drips into your tank cabinet.
Rigid grey PVC resists chlorinated water, mild acids, and common aquarium treatments. It will not rust, pit, or leach metals into your water column — safe for fish and invertebrates.
The 3-Way, 4-Way, 5-Way, and 6-Way options let you split or combine flow paths in a single fitting, reducing the number of joints in a sump manifold or pond distribution header.
Each variant is priced per piece so you can order exactly the types and sizes you need without buying a kit full of parts you won't use.
| Material | Rigid grey PVC (polyvinyl chloride) |
|---|---|
| Color / Finish | Grey |
| Connection Method | Solvent weld (socket end) |
| Fitting Types Available | Straight Coupling, Reducing Connector, 90° Elbow, 3-Way, 4-Way, 5-Way, 6-Way |
| Diameter Range (Straight / Elbow) | 20 mm – 160 mm (approx. ¾ in – 6¼ in) |
| Diameter Range (Reducing) | 25×20 mm up to 160×125 mm |
| Wall Thickness (estimated) | Typically 1.5–7 mm depending on diameter — See variant options |
| Working Pressure | See variant options |
| Temperature Rating | See variant options |
| Standard | Metric OD (DIN / ISO series) |
| Quantity per Order | 1 Pcs (sold individually) |
Measure the outer diameter (OD) of your existing pipe in millimetres. The fitting size listed (e.g., 25 mm) refers to the pipe OD it accepts. Do not measure the inner bore — PVC metric fittings are sized by pipe OD, not bore ID. If you are unsure, a digital caliper gives the most accurate reading.
Rigid grey PVC solvent-weld fittings are widely used in low-to-medium pressure water systems. Once the solvent cement has fully cured (typically 24 hours at room temperature), the joint is as strong as the pipe itself. For exact pressure ratings at your operating temperature, refer to the pipe manufacturer's PN (pressure nominal) specification for the diameter you are using.
Rigid grey PVC is chemically inert once cured and does not leach metals or plasticisers into water at normal aquarium temperatures. It is widely used in freshwater and marine aquarium plumbing. Allow solvent-cemented joints to cure fully and flush the system with water before introducing livestock.
A Straight Coupling joins two pipes of the same diameter end-to-end. A Reducing Connector has a larger socket on one end and a smaller socket on the other, allowing you to transition between two different pipe diameters — for example, stepping down from a 50 mm main line to a 32 mm branch without a separate reducer bushing.
No — these are metric OD fittings designed for metric-dimensioned PVC pipe. Imperial (inch-OD) pipe has different outer diameters and will not seat correctly in a metric socket, resulting in a weak or leaking joint. If you need to connect metric and imperial pipe, use a dedicated metric-to-imperial adapter fitting.
For manifolds with multiple branch outlets, the 3-Way, 4-Way, 5-Way, or 6-Way fittings let you split flow at a single point, reducing the total number of joints and potential leak points. Choose the number of ways based on how many branches you need. For a simple 90° direction change, the 90 Degree Elbow is the most compact option.
No power tools are required. You will need: a pipe cutter or fine-tooth saw to cut the pipe square, fine-grit sandpaper or a deburring tool to smooth the cut end, PVC primer (recommended), and PVC solvent cement. Apply primer to both the pipe end and fitting socket, then apply cement and push the pipe firmly into the socket with a slight twist. Hold for 30 seconds and allow to cure before pressurising.
