RSD-400 Professional Puddle Pump Kit – Flat Roof Water Removal Bundle (with Crab Sensor & 20 m Hose)

Stop standing water before it causes damage.
This RSD-400 Professional Puddle Pump Kit is the go-to solution for flat roof water removal, designed to leave surfaces virtually dry — perfect for roofers, property maintenance teams, and facilities managers.

Featuring the RSD-400 Automatic Puddle Pump with Crab Sensor, this kit includes a 20 m 1″ (25 mm) green MDS discharge hose and 2 stainless hose clips, giving you a complete, ready-to-use setup for fast, automatic surface water removal on flat roofs, car parks, basements, and other hard-standing areas.

✅ Ultra-low suction – removes water down to 1 mm
✅ Fully automatic operation via Crab Sensor
✅ Plug-and-play complete kit

✅ Why Choose This Flat Roof Pump Kit?

Designed for professional use, this bundle gives you everything you need to safely and efficiently clear standing water from roofs and hard surfaces without manual supervision.

✅ Automatic RSD-400 puddle pump with Crab Sensor
✅ 20 m 1″ (25 mm) green MDS discharge hose
✅ 2 x stainless hose clips for secure connection
✅ Leaves surfaces almost completely dry
✅ Ready to use out of the box – just connect and pump
✅ Protects roof membranes, insulation, and structures from water pooling damage

💧 Built Specifically for Flat Roof Water Removal

Standing water on flat roofs can cause leaks, membrane blistering, and costly structural damage.
This kit is purpose-built for rapid roof dewatering during and after heavy rainfall.

💧 Automatic start/stop control via the Crab Sensor – works unattended
💧 Low-level suction – removes water down to 1 mm deep
💧 Lightweight & portable – ideal for roof access and tight spaces
💧 Thermal overload protection for safety and longevity
💧 Perfect for emergency response and regular maintenance

Use it to keep flat roofs, terraces, podium decks, car parks, basements, lift shafts and concrete slabs free from pooling water.

✅ Ideal For

🏠 Domestic & commercial flat roofs
🏢 Office blocks, schools & hospitals
🏗️ Construction sites and new builds
🚗 Car parks, driveways & hard-standing areas
🕳️ Basements, lift pits & voids
🏚️ Property maintenance & roofing contractors

Whether you’re maintaining a flat roof system or dealing with flooding on site, this compact, powerful pump keeps you dry, compliant, and operational.

✅ Why This Kit Beats Buying Separately

One purchase – one complete flat-roof drainage solution.

🔧 Technical Specifications – RSD-400 Automatic Puddle Pump

🔩 Hose & Fittings Included

✅ Key Benefits at a Glance

✅ Complete professional flat-roof pump kit
✅ Automatic Crab Sensor for hands-free use
✅ Removes water down to 1 mm
✅ Ideal for roofs, car parks & basements
✅ Lightweight, portable & easy to use
✅ Fast deployment during heavy rainfall
✅ Prevents leaks, ponding & structural damage
✅ Designed for professional maintenance teams

🛠️ Need technical help or regular maintenance advice?

Our Henry Pumps specialists can help with installation, hose compatibility, or replacement Crab Sensors.

📞 0333 050 3748
✉️ sales@henrypumps.co.uk