Envirovalve Portable Drain Valve

Inflatable Drain Blocker

Developed in conjunction with the emergency services and the Environment Agency to safely seal a drain from above ground.

One size seals pipes and drains from 4″ to 15″ with no need to carry a range of bladders.

The lance allows the drain sealing bladder to be inserted into deep manholes without confined spaces equipment.

The simple to use high volume pump, with self-regulating pressure, makes it impossible to over-inflate the bladder.

Easy assembly lance and bladder grip aids quick deployment with retaining rope to recover bladder for reuse.

Broad range of chemical compatibility.

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Step 1: Use the lance and holder to insert bladder into the pipe.

Step 2: Pump up the bladder until fully inflated.

Step 3: Remove lance, release pump and move to next bladder.

Step 4: Bladder blocking drain

• PVC carry holdall
• Bladder and retaining rope
• Pump, airline and valves
• Lance and extension rods


Code Product Bladder Size (cm)
4400/FB Portable drain lance 37.5
4400/FB/450 Portable drain lance 45
4400/FB/600 Portable drain lance 60
4400/FB/750 Portable drain lance 75

Additional information

The quickest and easiest way to order any of our products or solutions is to call us on 01822 855 885, or you can complete the form on our Contact page to send us an email.

Our office opening hours are: Monday to Friday 6:30am to 5pm.