DIXON catalog · Quick couplings

DIXON Quick Disconnect Couplings

DIXON hydraulic and pneumatic quick couplings — from agricultural machinery to drilling rigs and blowout preventers. Interchangeable with common standards and brands.

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DIXON makes quick disconnect couplings for hydraulics, pneumatics, steam, pressure washing and diagnostics. The series are interchangeable to ISO 7241 (A and B), ISO 16028, ISO 15171-1, and with Snap-Tite, Parker, Stucchi, Faster, Bowes, Thor and other brands.

Common to all series: components machined from solid steel, brass or 303/316 stainless steel bar stock; stainless steel balls, retaining rings and springs; steel parts plated with RoHS trivalent chrome; hardened sleeves and nipples. Standard seals — NBR (−40…+121 °C), FKM and EPDM optional.

Hydraulic quick couplings

Data from the DIXON Europe catalogue (DQC).

Series overview

Series	Standard / interchange	Sizes	Pressure	Application
H	ISO 7241 Series B, poppet valve	⅛"–2½"	up to 345 bar	all industries
K	ISO 7241 Series A	¼"–2"	up to 345 bar	agriculture, general purpose
AG	ISO 7241-A, agricultural	¼"–1"	275 bar	agricultural machinery; ball valve — longevity, poppet — flow
V	Snap-Tite H/IH, tubular valve	⅛"–2½"	up to 450 bar	oil and petrochemicals; unvalved and pneumatic versions available
HT	ISO 16028, flush face	¼"–2"	up to 350 bar	hydraulic breakers, construction equipment; no spill; colour coding
HTE	ISO 16028, connect under pressure	⅜"–1"	345 bar	hydraulic breakers, demolition equipment
VEP	flush face, thread-to-connect (Stucchi VEP)	¼"–2"	up to 500 bar	connection under residual pressure; vibration and impulse
ST	Snap-Tite 71, flush face	¼"–2"	700 bar steel / 345 bar stainless	oil, gas, petrochemicals
W	Snap-Tite 78, Eaton 5100, Parker 6100 — wing nut	¾"–1½"	200 bar	oilfield equipment, dump trucks, submersible pumps
WS	Snap-Tite 75, high pressure	¾"–2"	345 bar	onshore and offshore
T	high-pressure screw-to-connect	—	—	hydraulic cylinders, high pressure
TR	TEMA	¼"–1"	up to 300 bar (¼")	general hydraulics
CW / CVV	European screw-together (Interva, Faster CW, Voswinkel HS)	¼"–1¼"	up to 450 bar	agriculture, general purpose
PD	ISO 15171-1, diagnostic	—	—	test points

HT — ISO 16028 Flush Face

flush face

A high-strength laser-cut valve guide keeps the valve stable with minimal flow restriction. The DORS retention system (dual opposing retention spheres) prevents valve stem ejection during surges. Bulkhead-mountable sleeve for breakaway, multi-plate and blind-mate installations. Fully rebuildable, seal kits available.

Materials: steel or 316 stainless steel; zinc-nickel plating
Valve seal: polyurethane or NBR-energised PTFE

HTE Equalizer

connect under pressure

An ISO 16028 nipple with an equaliser valve allows connection under residual line pressure. Zinc-nickel plating; hardened nipples resist brinelling under impulse loads.

VEP and VEP-BOP

thread-to-connect flush face

Used on drilling rigs and hydraulic power units where lines must be connected and disconnected under pressure. The threaded no-spill design is the optimal solution for high pressure and impulse loads. A patented valve retention system reduces pressure drop.

Sizes: ¼"–2"
Interchange: Stucchi VEP/VEP-HD, DNP PST4/FSI, Holmbury HFT, Parker FET

W-Series Wingstyle

wing nut style

Hybrid valve for high flow and pressure; bonded-flange valve and anti-extrusion seal pack for impulse service; full hex on both halves; O-ring connection indicator.

Body sizes: ¼", ⅜", ¾", 1", 1¼", 1½"
Materials: brass body, steel wing or hex nut; 1" — all steel
Thread: NPTF / BSPP

H-Series: steam and food-grade versions

HS — ISO 7241-B for steam: EPDM seals for continuous steam service, flanged sleeve for operation with gloves, redundant O-ring in brass couplers. Food-grade H-Series: FDA-compliant FKM — fryers and fryer-oil filtering; nickel-plated steel, 303 and 316 stainless. Also slide-gate couplers for steel mills.

Quick couplings for blowout preventers (BOP)

VEP-BOP, H-BOP and WS-BOP series are designed for blowout preventer systems onshore and offshore.

BOP Series

Fire tested and Lloyd’s certified to API 16D
Test pressure 5000 psi (≈345 bar)
Red powder-coated sleeve and nipple hex for quick identification
Locking sleeve as standard; hardened nipples

Pneumatic quick couplings

For compressed air, nitrogen and inert gases, pneumatic tools and air supply systems.

Dix-Lock N-Series

Bowes interchange

Used on large pneumatic tools — hammers, chippers, cable winders, impact wrenches; in refineries for air, water and nitrogen; in military breathing air systems; on oil rigs for jacks and tools. Connect: push — twist — click; disconnect: retract — twist — pull. The seal is pneumatically energised.

Materials: steel (trivalent chrome), brass, 303 stainless; sleeve — zinc die-cast
Pressure: brass — 300 psi ≈ 21 bar, steel/stainless — 500 psi ≈ 34 bar
Temperature: −40…+121 °C
Standards: MIL-C-3486, A-A-50431A, Bowes 51000, National Series-B

Dual-Lock P-Series

Thor interchange

Spring-loaded interlocking design, full flow, push and twist, locking clip, optional locking key. Versions with hose barb and locking sleeve (hose ⅜"–1"), male and female thread, knurled flanged sleeve for use with gloves.

Pressure: 300 psi ≈ 21 bar
Temperature: −40…+121 °C
Interchange: Thor PHC, National Series-A, Campbell TLH

Other pneumatic and special couplings

J-Series (Truflate) — automotive service; NK-Series (Nitto) — factory air to pneumatic tools
DF/D/F-Series — industrial profile, automatic and manual, safety exhaust
Bayonet push-twist (35 bar) — air, inert gases, tools, fire hose
E-Series — straight-through for pressure washing
316 stainless water-blast couplings — up to 1350 bar; TD-Series 15K/20K psi — water-blast and wireline equipment
For jacks and hydraulic cylinders — screw-together up to 700 bar

Descriptions and specifications are given according to the manufacturers and may change. Please confirm parameters with our specialists before ordering.

Questions and answers

Frequently asked questions

What is the difference between ISO 16028 and ISO 7241?

ISO 16028 is a flush-face coupling: virtually no spillage or air inclusion on disconnection, and the face is easy to clean. ISO 7241 is a classic poppet or ball valve coupling (Series A and B).

Can I replace another brand's quick couplings with DIXON?

Yes. DIXON series are made to ISO and are interchangeable with Snap-Tite, Parker, Stucchi, Faster, Bowes, Thor and others — we will match by brand and part number.

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