Couplings and Disconnects
Protective and Dust Caps for Couplings
Protective and dust caps close off ports that are not in use: spare manifold outlets, reserve ports on distribution units, open threads on pump sets and filter housings, and hose ends in storage. Against internal pressure the cap seals like a plug; on the outside it keeps dust, swarf and moisture away from the sealing face. A contaminated sealing face is the most common cause of dripping couplings. The category holds 206 items.
The range covers round caps and hexagon versions across widths 36, 37 and 46 mm, with G 1, Rp 1, G 1 1/4, Rp 1 1/4 and NPT 3/4 inch threads. Materials are 1.4408 stainless steel, brass and nickel-plated brass, plus the plastic caps of the Blue Series for a 16 mm hose outside diameter. Pressure ratings are stated per item, for example PN 16 bar.
- 163 items
- 3 manufacturers
- Net prices plus VAT
Buying guide
How to choose Protective and Dust Caps for Couplings
What matters when choosing: properties, comparison and typical applications.
Technical characteristics of sealing caps
Versions compared
Hexagon, round and plastic cap
| Criterion | Hexagon 1.4408 stainless | Round 1.4408 stainless | Hexagon brass | Blue Series |
|---|---|---|---|---|
| Sizes listed | G 1 AF 37, Rp 1 AF 37, G 1 1/4 AF 46, Rp 1 1/4 AF 46 | G 1, Rp 1, G 1 1/4, Rp 1 1/4 | G 1 AF 36, G 1 1/4 inch | 16 mm hose outside diameter |
| Material | 1.4408 stainless steel | 1.4408 stainless steel | brass, nickel-plated brass | plastic |
| Tightening | with a spanner | by hand | with a spanner | push on |
| Pressure bearing | yes, stated per item | yes, stated per item | yes, for example PN 16 bar | no, protection only |
| IT circuit | unrestricted | unrestricted | only in an all-brass circuit | unrestricted |
| Typical purpose | permanently closed outlet | reserve port on a distribution unit | brass and gunmetal manifolds | hose ends in storage and transit |
Typical applications
- Permanently closing unused outlets on a rack manifold
- Keeping reserve ports on the coolant distribution unit free for later extensions
- Securing open threads on pump sets, filter housings and vessels
- Protecting the sealing faces of couplings and nipples from dust and swarf
- Closing hose ends and pre-assembled lines during storage and transit
- Pressure testing a branch with individual outlets blanked off