Is the Polypropylene twist-on plug, type HS compatible with standard quick-connect couplings and does it protect against contamination and damage during storage and transport?

Yes. The Polypropylene twist-on plug, type HS is designed specifically as a protective plug for quick-connect couplings. Made of polypropylene and supplied as a twist-on cap, it is compatible with standard quick-connect coupling interfaces of the HS type and provides a secure fit. Its primary function is to protect the coupling from contamination (dust, dirt, moisture) and mechanical damage during storage and transport, helping to preserve sealing surfaces and internal components. The red polypropylene construction offers chemical resistance, durability and lightweight protection suitable for handling and transit.

Can the Polypropylene twist-on plug, type HS withstand UV exposure and outdoor storage without degrading?

Polypropylene twist-on plug, type HS offers good resistance to moisture, chemicals and general outdoor conditions, but standard polypropylene is only moderately UV-stable. Prolonged direct sunlight and long-term outdoor storage can cause gradual UV degradation (fading, brittleness, loss of mechanical strength). For reliable long-term outdoor/UV exposure, use a UV-stabilized or UV-treated polypropylene version or additional UV-protective coating. If only occasional outdoor use or short-term storage is expected, the standard Polypropylene twist-on plug, type HS should perform acceptably.

Does the Polypropylene twist-on plug, type HS resist chemicals commonly used in industrial cleaning?

Polypropylene twist-on plug, type HS Format: Polypropylene is a thermoplastic widely used for chemical-resistant components. In general, polypropylene shows good resistance to many alkalis, acids, and solvents commonly found in industrial cleaning (e.g., diluted detergents, alkaline cleaners, many alcohols and mild acids). It is also resistant to water, steam and many salts. However, chemical resistance depends on concentration, temperature, exposure time and specific chemicals. Polypropylene performs poorly with strong oxidizing acids (concentrated nitric acid, sulfuric acid at high concentrations), certain chlorinated hydrocarbons, aromatic hydrocarbons (e.g., toluene, benzene) and some aggressive solvents. High temperatures and prolonged exposure can reduce its resistance. Conclusion: Polypropylene twist-on plug, type HS Format will resist many common industrial cleaning agents (dilute alkalis, detergents, mild acids, alcohol-based cleaners) but may be attacked by strong oxidizers, concentrated acids, certain chlorinated or aromatic solvents, or under high-temperature/prolonged exposure. For critical applications, verify compatibility with the exact cleaning chemicals, concentrations and temperatures, or consult the material chemical-resistance chart or the manufacturer.

Quick-coupling plug cap screw-together of polypropylene, type HS

All products, Hydraulic quick couplings/

Additional information

Material	P – material (plastic)

Quick-coupling plug cap screw-together, type HS, protecting against dirt and damage. Material: polypropylene. Color: red.

List of product variants

Article number	Product variant name	DN	BAR	Availability	Actions
HQ-HS06-M-RED	Plug cap HS 1/4", PP red	-	-	In stock	Enquiry
HQ-HS10-M-RED	Plug cap HS 3/8", PP red	-	-	In stock	Enquiry
HQ-HS12-M-RED	Plug cap HS 1/2", PP red	-	-	In stock	Enquiry
HQ-HS19-M-RED	Plug cap HS 3/4", PP red	-	-	In stock	Enquiry
HQ-HS25-M-RED	Plug cap HS 1", PP red	-	-	In stock	Enquiry
HQ-HS32-M-RED	Plug cap HS 1.1/4", PP red	-	-	In stock	Enquiry