15mm Type A Chrome Drain Off Cock Brass Drain Valve
This 15mm Type A Heavy Pattern Chrome Drain Off Cock is a professional-quality drain valve designed for controlled draining and maintenance of plumbing and heating systems.
15mm Type A Chrome Drain Off Cock Brass Drain Valve
This 15mm Type A Heavy Pattern Chrome Drain Off Cock is a professional-quality drain valve designed for controlled draining and maintenance of plumbing and heating systems.
Product Options
Quick Trade Summary: 15mm Type A Drain Off Cock (DOC)
MEP Stock supplies heavy-duty forged brass 15mm Type A drain off cock valves manufactured to BS 2879 standards for draining down central heating radiators, boilers, and low-point potable pipework. Features a ribbed hose union connection and square drive gland operating spindle.
Essential Low-Point Drain Valves for Heating & Potable Maintenance
System draining, chemical power flushing, and winter decommissioning require robust drain cocks that never seize or weep under repeated operation. Manufactured to BS 2879, our Type A 15mm compression drain cocks feature precision machined brass seats, replaceable rubber gland washers, and a tapered ribbed discharge tail designed to grip standard garden hosepipes securely with a Jubilee clip.
Engineering Specifications
| Standard & Certification | BS 2879 Standard (Type A Drain Off Cock) |
| Body Material | High-Grade Forged Brass CW617N |
| Inlet Connection | 15mm Compression Nut & Brass Olive (BS EN 1254-2) |
| Discharge Connection | Ribbed Tapered Hose Tail for 1/2" (12.5mm) Hose |
| Actuation Spindle | Square Key Drive Head with Threaded Packing Gland |
| Max Operating Pressure | 10 bar (PN10) |
| Max Operating Temperature | 110°C (Central Heating & Potable Water) |
BS EN Installation Protocol
- Step 1: Select Low Point — Install at the lowest point of radiator circuits, boiler return manifolds, or pipework drops.
- Step 2: Prepare 15mm Copper — Cut pipe square, deburr thoroughly, and slide compression nut and olive onto pipe.
- Step 3: Secure Compression Inlet — Push pipe fully home into valve body and tighten nut 3/4 to 1 turn past hand-tight.
- Step 4: Attach Drain Hose — Slide 1/2" reinforced garden hose fully over ribbed nozzle and clamp securely with a hose clip.
- Step 5: Operate with Radiator Key — Use standard square radiator key or adjustable spanner to back off spindle smoothly until full drain flow is achieved.
Frequently Asked Questions
What is the difference between a Type A and Type B drain off cock?
Type A has a male compression or tail inlet; Type B features an extended male BSP thread.
Type A drain cocks feature a direct 15mm compression tail or socket connection for copper pipe; Type B drain cocks feature an extended male BSP thread designed to screw directly into boiler casings or radiator tapping bushes.
How do I stop a drain cock from dripping after draining down?
Nip the square operating spindle clockwise and tighten the gland packing nut slightly.
Nip the square operating spindle clockwise firmly to seat the internal washer. If water weeps around the spindle shaft, tighten the gland packing nut 1/8th turn clockwise with a small spanner to compress the graphite/PTFE packing seal.
Can I leave a hose connected permanently to this valve?
No. Always disconnect hoses and verify zero drip after maintenance.
No. Always disconnect drain hoses after maintenance. For permanent connections, fit an end cap or isolating barrier to prevent accidental siphonage.
What key operates this drain cock?
Operated by a standard square radiator bleed key or small adjustable spanner.
Operated by a standard square radiator bleed key or small adjustable spanner.
Is this drain cock suitable for power flushing?
Yes, heavy forged brass construction withstands chemical flushing agents.
Yes, heavy forged brass construction easily withstands circulating chemical inhibitors, descaling acids, and power flush pressures.
What hose size fits the outlet nozzle?
Standard 1/2" (12.5mm) reinforced garden hose.
Standard 1/2" (12.5mm) reinforced garden hose clamped with a worm-drive Jubilee clip.
Order Trade 15mm Type A Drain Off Cocks Online
Single pieces and contractor packs available with next-day trade dispatch.
Browse Full Valves & Controls Range →Quick Trade Summary: 15mm Type A Drain Off Cock (DOC)
MEP Stock supplies heavy-duty forged brass 15mm Type A drain off cock valves manufactured to BS 2879 standards for draining down central heating radiators, boilers, and low-point potable pipework. Features a ribbed hose union connection and square drive gland operating spindle.
Essential Low-Point Drain Valves for Heating & Potable Maintenance
System draining, chemical power flushing, and winter decommissioning require robust drain cocks that never seize or weep under repeated operation. Manufactured to BS 2879, our Type A 15mm compression drain cocks feature precision machined brass seats, replaceable rubber gland washers, and a tapered ribbed discharge tail designed to grip standard garden hosepipes securely with a Jubilee clip.
Engineering Specifications
| Standard & Certification | BS 2879 Standard (Type A Drain Off Cock) |
| Body Material | High-Grade Forged Brass CW617N |
| Inlet Connection | 15mm Compression Nut & Brass Olive (BS EN 1254-2) |
| Discharge Connection | Ribbed Tapered Hose Tail for 1/2" (12.5mm) Hose |
| Actuation Spindle | Square Key Drive Head with Threaded Packing Gland |
| Max Operating Pressure | 10 bar (PN10) |
| Max Operating Temperature | 110°C (Central Heating & Potable Water) |
BS EN Installation Protocol
- Step 1: Select Low Point — Install at the lowest point of radiator circuits, boiler return manifolds, or pipework drops.
- Step 2: Prepare 15mm Copper — Cut pipe square, deburr thoroughly, and slide compression nut and olive onto pipe.
- Step 3: Secure Compression Inlet — Push pipe fully home into valve body and tighten nut 3/4 to 1 turn past hand-tight.
- Step 4: Attach Drain Hose — Slide 1/2" reinforced garden hose fully over ribbed nozzle and clamp securely with a hose clip.
- Step 5: Operate with Radiator Key — Use standard square radiator key or adjustable spanner to back off spindle smoothly until full drain flow is achieved.
Frequently Asked Questions
What is the difference between a Type A and Type B drain off cock?
Type A has a male compression or tail inlet; Type B features an extended male BSP thread.
Type A drain cocks feature a direct 15mm compression tail or socket connection for copper pipe; Type B drain cocks feature an extended male BSP thread designed to screw directly into boiler casings or radiator tapping bushes.
How do I stop a drain cock from dripping after draining down?
Nip the square operating spindle clockwise and tighten the gland packing nut slightly.
Nip the square operating spindle clockwise firmly to seat the internal washer. If water weeps around the spindle shaft, tighten the gland packing nut 1/8th turn clockwise with a small spanner to compress the graphite/PTFE packing seal.
Can I leave a hose connected permanently to this valve?
No. Always disconnect hoses and verify zero drip after maintenance.
No. Always disconnect drain hoses after maintenance. For permanent connections, fit an end cap or isolating barrier to prevent accidental siphonage.
What key operates this drain cock?
Operated by a standard square radiator bleed key or small adjustable spanner.
Operated by a standard square radiator bleed key or small adjustable spanner.
Is this drain cock suitable for power flushing?
Yes, heavy forged brass construction withstands chemical flushing agents.
Yes, heavy forged brass construction easily withstands circulating chemical inhibitors, descaling acids, and power flush pressures.
What hose size fits the outlet nozzle?
Standard 1/2" (12.5mm) reinforced garden hose.
Standard 1/2" (12.5mm) reinforced garden hose clamped with a worm-drive Jubilee clip.
Order Trade 15mm Type A Drain Off Cocks Online
Single pieces and contractor packs available with next-day trade dispatch.
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