A Y strainer is cheap insurance against an expensive callback. Fit one upstream of a pressure reducing valve, thermostatic mixing valve, water meter or pump, and it catches the scale, weld swarf and grit that would otherwise score a valve seat or jam a cartridge. Skip it, and the first service call on that PRV is often a strainer problem wearing a PRV costume. The real question on a trade order isn't whether to fit one — it's which body material, and which ones are actually WaterMarked for the job.
DZR brass vs bronze vs 316 stainless
Our Y strainer range covers three body materials, and they're not interchangeable on compliance grounds:
- Lead-free DZR brass (3514, 6–50mm) — WaterMarked, built for potable water lines ahead of meters, PRVs, pumps and TMVs. A removable stainless screen means you clean it without re-plumbing the joint.
- 316 stainless steel (4060, 6–80mm) — investment-cast, heavy pattern, WaterMarked to AS 3688 (Licence WM-032263), rated to 2500kPa and -20°C to 200°C. Spec this one for corrosive environments or temperature extremes that rule out brass — solar thermal loops, industrial lines, anywhere the fluid runs hot or aggressive.
- Bronze (1524, 15–50mm) — not WaterMark certified at this size. The listing itself is explicit: these sizes "must not be used in AS/NZS 3500 drinking-water installations." They're the right call for non-potable, heating or industrial lines where cost matters more than a WaterMark licence — just don't let one end up on a drinking-water job by mistake.
- Bronze, 500 micron mesh (1524W, 65–100mm) — a separate listing from the 1524 above, and this one is WaterMarked to AS 3688, rated 2500kPa and -10°C to 180°C, made in Italy with a reinforced 316 mesh. Same metal, same family name, different compliance status — check the licence on the listing, not just the word "bronze" on the box.
The two-in-one option
The 3020 combines a full-bore ball valve and Y strainer in one lead-free DZR brass body (20–25mm, WaterMarked). It's a genuine joint-saver at a meter, PRV, hot water unit or backflow device — isolate and filter from the one fitting instead of plumbing a separate valve and strainer in line. The trade-off is cost: at $157.95–$206.95 it's priced well above a standalone strainer, so it earns its place where space is tight or a service point needs isolation anyway, not as a default upgrade on every job.
Servicing: replace the mesh, not the body
A clogged screen doesn't mean a new strainer. Spare 316 stainless mesh and lead-free sealing washer kits are stocked separately (15–50mm, from $4.35 for the mesh alone), so a routine service call is a five-minute screen swap rather than re-plumbing the fitting. Keep a few sizes in the van rather than carrying spare whole strainers.
Picking the right one
For a straightforward potable-water install ahead of a meter, PRV or TMV — see our Rinox PRV comparison for sizing the valve itself — the DZR brass 3514 covers 6–50mm and is the standard spec. Need the valve and strainer combined to save a joint: the 3020, 20–25mm. Running hot, corrosive or heavy-duty industrial lines, or need the 2500kPa/-20–200°C envelope: the 316 stainless 4060. Non-potable or heating circuit where WaterMark doesn't apply: the bronze 1524 is the cheaper option — just not for drinking water. Large-bore potable water at 65–100mm: the bronze 1524W, which is WaterMarked despite sharing a name with the non-WaterMarked small-bore 1524.
Frequently Asked Questions
Where should a Y strainer actually go?
Upstream — install it before the component you're protecting (a PRV, TMV, meter or pump), with the flow direction arrow on the body pointing the right way. It needs to catch debris before that component sees it, not after.
Can I use a bronze Y strainer on a drinking water line?
Only the 65–100mm bronze 1524W, which is WaterMarked to AS 3688. The 15–50mm bronze 1524 is not WaterMark certified and the listing specifically says it must not go on an AS/NZS 3500 drinking-water installation — use the DZR brass 3514 or 316 stainless 4060 instead at those smaller sizes.
Do I need to replace the whole strainer when the screen clogs or tears?
No. Spare mesh and sealing washer kits are sold separately for 15–50mm WaterMarked Y strainers, so you can swap just the screen rather than the whole body.
What's the benefit of the combined ball valve and Y strainer (3020) over two separate fittings?
One body instead of two means one less joint to leak and less space needed at the install point — useful at meters, PRVs, hot water units and backflow devices where room is tight, at a price premium over a standalone strainer.