---
title: "Buyer guides | Lineside Dispensing"
url: https://lineside-dispensing.com/guides/
description: "Practical guides for buyers of dispensing needles, static mixers, cartridges and dispensing guns: gauges, fittings, mixer systems and mix ratios."
---

1. Guides

# Buyer guides

Short, practical answers to the questions resellers and their customers ask most.

- [Dual cartridges, mix ratios and dispensing gunsA dual cartridge ratio such as 2:1 means two volumes of component A leave the cartridge for every one volume of component B, and the chamber sizes fix that ratio. Choose a gun built for that exact ratio and cartridge format, manual for intermittent work or pneumatic for long runs, and a mixer that fits the cartridge outlet.Read the guide](/guides/dual-cartridges-and-dispensing-guns/)
- [How to choose a dispensing needle gaugeHigher gauge numbers mean finer bores: pick a finer gauge for thin fluids and fine dots, and a wider bore or a tapered tip for thick pastes. Choose by the actual ID and OD on the spec table, keep the needle as short as the job allows, and never identify gauge by hub color.Read the guide](/guides/needle-gauge-guide/)
- [How to choose a static mixerMatch the mixer to the cartridge inlet first (A-system bayonet, B-system, C-system bell or F-system), then choose the shortest element count that gives a uniform, fully cured test bead. The cartridge sets the ratio, but 4:1 and 10:1 materials need a mixer built for high ratios.Read the guide](/guides/static-mixer-guide/)
- [Luer lock vs Luer slip dispensing needlesA Luer lock needle screws into a threaded collar on the syringe or valve outlet and cannot pull off without being unscrewed. A Luer slip needle sits on the same taper held only by friction, so for any pressure-fed dispensing a locking or threaded connection is the safer choice.Read the guide](/guides/luer-lock-vs-luer-slip/)