This plunger for drain rods is a screw‑on cup plunger designed to be used with drain rod assemblies to create a temporary seal, displace water or push soft blockages through lengths of waste and soil pipe. It is primarily used by plumbers, drain and sewer technicians, and facilities maintenance teams where a removable sealing head is needed to test or clear short runs of drainage without mechanical cutting tools.

The plunger head is moulded from nitrile rubber (NBR) selected for oil and water resistance and dimensional stability; the rubber grade conforms to common industry specification requirements for elastomers (NBR to ISO 1629). The shank and screw fitting are manufactured from AISI 304 (EN 1.4301) stainless steel, giving good corrosion resistance in wet environments and reasonable mechanical strength for repeated screw‑in use. The thread is supplied as a metric male thread manufactured to ISO metric thread form (ISO 261 / ISO 965) so it will fit standard metric drain rod couplings; the head type is a shallow cup plunger which offers effective sealing on flat or slightly concave pipe ends. As this is a screw‑in accessory there is no drive slot or hex required beyond the rod coupling itself.

Typical applications include temporary sealing for pressure checks, pumping or evacuating sections of pipework, bedside or sink trap work, and short‑range unblocking on domestic and light commercial systems. The product is commonly used in domestic plumbing, building maintenance, drainage contractors, and municipal cleansing teams where simple, fast temporary seals are required.

Key benefits are the nitrile rubber’s resistance to oils and detergents commonly encountered in drainage, the stainless steel shank’s resistance to corrosion compared with plated mild steel, and compatibility with metric drain rod systems conforming to ISO metric thread standards. The bonded rubber head provides a flexible sealing face while the metal shank ensures secure coupling to rods.

Duchy Fasteners stocks this plunger in a selection of thread sizes and pack quantities to suit common drain rod systems; please contact us for availability of single items or multi‑pack options.