Choosing the Right Nozzle and Swivel
The nozzle is where the fuel meets the tank. Pick wrong and you cross-contaminate fluids, overfill the receiving tank, or wreck a 6,000 dollar bowser hose because the swivel could not take the twist. Three things drive the choice: the fluid, the manual or automatic shut-off behaviour you want, and whether you need a dry-break disconnect.
Fluid. Diesel and lubricants run on standard cast or aluminium nozzles. Petrol (ULP) needs a dedicated petrol nozzle because the spout diameter and shut-off curve are different (the Elaflex ZVA Slimline 2 ULP and Macnaught ULP Manual are purpose-built). AdBlue or DEF needs a 19 mm stainless steel nozzle with Viton seals: an AdBlue Auto Shut-Off (the Elaflex ZVA 4.0 AB or the GO Fill 19 mm 316 stainless) is the only safe choice. Running a diesel nozzle on AdBlue corrodes the brass internals; running an AdBlue nozzle on diesel is fine but slower than a purpose-built diesel auto.
Manual vs automatic. Manual nozzles (PIUSI SELF 2000 / SELF 3000, Macnaught manual diesel) put the operator in charge of the shut-off lever. Use manual where the operator stays at the nozzle and you want a low part count. Automatic nozzles (Elaflex ZVA 25 at 140 lpm, ZVA 32 at 200 lpm, PIUSI A60 at 70 lpm, PIUSI A120 at 120 lpm) shut off when the receiving tank reaches the spout sense port. Use automatic on fleet refuelling, AdBlue dispensing where overfill matters, or anywhere the operator is doing other tasks at the same time.
Swivel. Every nozzle that is in regular use should have a swivel between the nozzle inlet and the hose. The swivel lets the nozzle rotate without putting twist into the hose, which is the single biggest cause of premature hose failure. Most automatic nozzles ship with a single-plane swivel built in; for high-cycle applications fit a dual-plane swivel (PIUSI 1 inch dual plane) so the nozzle can rotate AND the hose can swing without coupling-side strain. For high-pressure or hazardous-area dispensing where break-away is mandatory, the Banlaw 800 Series dry-break range gives a positive disconnect with zero spillage.
Oil and grease control. Workshop oil and grease applications use control guns, not bowser-style nozzles. The Macnaught flexible-extension and mechanical-flexible oil control guns dispense oil by trigger volume; the Graco PM and SD series electronic preset meters batch-dispense a specific quantity (e.g. 4.5 L into a sump) and shut off automatically. These are technically dispense valves, not transfer nozzles, but they live in this collection because the install point is the same.