
Plumbing a Kitchen Sink Drain: Step‑By‑Step Guide
A clear, practical guide to plumbing a kitchen sink drain. Get sizes, falls, venting, and a step‑by‑step method contractors can follow on any job.
Create professional quotes with the power of AI. Track payments in real-time. Focus on your craft, not paperwork.



Our platform combines powerful automation features with intuitive design to deliver an exceptional experience.

Create professional quotes lightning-fast. Save time, impress your clients, and send everything with one click.

Generate and send polished invoices in seconds. Streamline your billing and keep every job organized, no manual effort required.

Monitor client payments at a glance. Instantly see what's paid, what's overdue, and follow up without the hassle.

Ditch the paperwork and reclaim your time with Donizo.
Contractors across Europe trust Donizo to handle their quotes and invoices while they focus on what they do best: their craft.
Don't just take our word for it. Here's what our customers have to say about their experience with Donizo.
Plumber in Paris
I used to waste hours writing up quotes and chasing payments. Now with Donizo, I just talk into my phone and in under a minute I have a professional PDF proposal ready to send. I see instantly who's paid and who hasn't. I'm back to focusing on the job, not the paperwork.
Electrician in Lyon
I've tried many similar tools, but nothing compares to the ease of use and powerful features Donizo offers.
Carpenter in Bordeaux
The customer support is exceptional, and the platform keeps getting better with every update. Absolutely worth the investment.
Grow your business with our practical guides and industry insights

A clear, practical guide to plumbing a kitchen sink drain. Get sizes, falls, venting, and a step‑by‑step method contractors can follow on any job.

Lightly roughening valve threads improves sealant bite, cuts leaks, and saves rework. Learn when, how, and what to avoid with this simple job-site method.

Snapped tap threads stuck in the body? Use this fast, low-risk DIY expansion plug to remove broken faucet threads cleanly. Simple tools and clear steps.

On renovation plumbing, technology alone won’t save a job. Here’s how to choose the right tools, blend them with smart tech, and run a clean, safe, profitable workflow.

A very smart plumber shared a trick: use a wet/dry vacuum to clear sink clogs in minutes. Simple steps, clear safety tips, and pro prevention advice.

Learn a new easy water tank fitting process that reduces leaks, saves 60–90 minutes, and delivers clean, compliant installs. Step-by-step, tools, testing.
Everything you need to know about Donizo
Donizo works directly in your browser. No downloads or special devices required. Just open the site and start.