Most call-backs on commercial drainage work come down to one of three things: debris getting into the line, backflow where it shouldn't happen, or a pressure test that won't hold. Here's how to spec each one properly.
Strainer baskets — matching the basket to the outlet
Our 316 stainless floor waste range and the 304 stainless commercial drain strainer basket range cover 80mm, 100mm and 150mm outlets — removable baskets make a real difference on maintenance call-backs in commercial kitchens and washdown areas, since the trap itself never needs to come out to clear debris. Match the basket size to the outlet exactly; oversizing to "make it fit" is the single most common cause of a strainer working loose under flow.
Dual check valves — where backflow prevention is non-negotiable
A 15mm brass dual check valve, 1200kPa rated with a Neoperl valve core is the standard spec for point-of-use backflow protection on hose taps, irrigation take-offs and similar low-hazard connections under AS/NZS 3500. Dual check isn't a substitute for testable backflow prevention on higher-hazard connections — know which category you're dealing with before you spec down to a dual check.
Test plugs — pressure-testing without the mess
An inflatable test plug with hand pump earns its keep on any job where you need to isolate and pressure-test a section without cutting or capping. For anyone running multiple pipe sizes regularly, the 50/100/150mm bundle covers the common range in one kit rather than buying plugs one size at a time as jobs come up.
All three categories are stocked and shipped Australia-wide — browse the full floor waste and drainage accessory ranges for the rest of the fit-out.
Frequently Asked Questions
What size strainer basket do I need?
Match the basket exactly to your outlet diameter — 80mm, 100mm or 150mm. Don't oversize to force a fit; it's the most common cause of a basket working loose.
Is a dual check valve enough backflow protection for a hose tap?
Yes — for low-hazard connections like garden hose taps, a 1200kPa-rated dual check valve is the compliant standard spec under AS/NZS 3500.
How long should I pressure-test a line before covering it?
Follow AS/NZS 3500's specified test duration and pressure for the pipe material and application — don't cover or commission until the test has held for the full specified period without pressure drop.
Can I reuse an inflatable test plug across different pipe sizes?
Only within the plug's rated range — a plug suited to 50-150mm won't safely seal outside that range, which is why a bundle covering all three sizes is the practical trade spec.