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Overview
The Cap with Eccentric Hole, also known as a Drain Cap, is a specialized piping component designed to seal the pipe end while providing a side-offset opening for controlled drainage, sampling, or fluid discharge. Its eccentric hole ensures proper drainage or access without raising the pipe centerline, making it ideal for floor-level or wall-adjacent installations.
Product Description
This fitting features a grooved or mechanical connection on one end and a precisely machined eccentric hole on the cap. The offset hole allows fluids to be drained efficiently while keeping the main pipeline sealed. Designed for mechanical installation without welding, it simplifies system maintenance, supports partial isolation, and reduces potential leak points. The cap is rated for standard pipeline pressures and can be used in various industrial and commercial piping systems.
| Sizes: | DN40–DN250 (1½″–10″) threaded outlet |
| Materials: | ASTM A536,GRADE 65-45-12,QT450-10 |
| Threads: | ASME B1.20.1,ISO 7-1,BS21,BSPT,NPT,GB 7306 |
| Surface Treatment: | Electrophoretic painted,Electroplated, Epoxy, Hot-dip Galvanized |
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Grooved or mechanical end for easy, fast installation
Eccentric hole for drainage, sampling, or side discharge
Maintains secure sealing under normal system pressures
Durable construction suitable for industrial and commercial applications
Simplifies pipeline maintenance and fluid management
Compatible with standard grooved piping systems
Provides pipe-end closure while allowing controlled side flow
Enables drainage, sampling, or connection to auxiliary devices
Minimizes leakage risks at the pipe end
Supports maintenance, inspection, or system flushing
Maintains structural and pressure integrity of the pipeline
Cap with Eccentric Hole / Drain Cap is widely used in:
Fire protection and sprinkler systems requiring drainage points
HVAC and chilled water pipelines for system flushing or pressure relief
Industrial water, chemical, and process pipelines for sampling or discharge
Pump rooms and mechanical equipment for maintenance access
Retrofit projects where partial access and pipe-end closure are needed
It is particularly effective for installations near floors or walls where space constraints prevent using a standard concentric pipe cap.
Main production process
Installation Instruction For Threaded &Grooved Mechanical Tee
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| 1.Take out the Rigid &Flexible Coupling Clean the gasket sealing surface within 16mm of the hole and visually inspect the sealing surface for defects that may prevent proper sealing of the gasket.Don't drill the hole on weld line. | 2.Split the Rigid &Flexible Coupling If any burrs or slug exists at the pipe hole,please remove them before assembly,to protect the gasket and avoid leakage. | 3.Pipe preparation Insert the gasket into outlet housing making sure the tab in the gasket line up with the tab recesses in the housing.Align outlet housing over the pipe hole making sure that the locating collar is in the pipe hole. | 4.Lubricate gasket Align the strap around the pipe,inser the bolts and tighten the nuts finger tight. | |||||
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| 5.Gasket installation Alternatively and evenly tighten the nuts to the specified bolt torque. | 6.Housing installation There should be even gaps on two sides between upper and lower housings. | |||||||
FAQ
Q1: What is the purpose of the eccentric hole?
A: The offset hole allows for drainage, sampling, or auxiliary connections while keeping the main pipe securely sealed.
Q2: Can it handle high-pressure systems?
A: Yes, it is designed to maintain proper sealing under standard grooved piping system pressures.
Q3: Does installation require welding or threading?
A: No. The grooved or mechanical end allows for tool-assisted installation without welding.
Q4: Where is this cap typically applied?
A: In fire protection, HVAC, industrial piping, and mechanical systems requiring drainage or auxiliary access.
Q5: Can it be used for both temporary and permanent setups?
A: Yes. It provides reliable sealing while allowing controlled drainage or sampling for both temporary and permanent use.
