• Home
  • Quick Connect Fitting Comparison

Quick-Connect Fitting Comparison

G.A. Murdock is a wholesale supplier of plastic quick-connect fittings for use in water and air applications. We sell direct to Water conditiong dealers, manufacturers and other Qualified Wholesale Buyers.

We manufacture several lines of Mur-lok Fittings, Valves and Tubing in South Dakota, USA. We also distribute all of the quick connect fitting lines listed below from our warehouses in South Dakota and Florida. These plastic fittings can be used in cold water applications and non-oiled compressed air solutions within the given pressure limits. Additional chemical compatibility information is available depending on the chemical solution passing through the fittings and o-rings. Most fittings have been certified for use with purified and Reverse Osmosis(RO) drinking water.

Shop All Fittings

 Mur-lok® Polypropylene FittingsJohn Guest Speedfit® FittingsJohn Guest Twist & Lock CTS FittingsSeaTech/AquaLock® Fittings

 Shop Mur-lokShop JG SpeedfitShop JG CTSShop SeaTech
MaterialBlack or White Polypropylene
Black polypropylene also provides UV resistance.
Grey Acetal
Other materials available upon request.
Chemical Compatibility
Black or White Engineered Plastic
Polymer details not available from manufacturer
Off-White Polysulfone
Chemical Compatibility
O-Ring SealsDual EPDM O-Rings
2 EPDM o-rings per connection.
Optional fluorocarbon o-rings for increased chemical resistance
Buna-N O-Rings
1 Buna-N o-ring per connection
Buna-N O-Rings
1 Buna-N o-ring per connection
EPDM O-Rings
1 EPDM o-ring per connection

Nominal Tube Sizes

Outer Diameter
, 5/16", 3/8", 1/2"

Outer Diameter
, 5/16", 3/8", 1/2", 5/8"
Inner Diameter (CTS)
1/2", 3/4", 1"
Inner Diameter (CTS)
1/4" (OD), 3/8", 1/2", 3/4", 1"
Working Temperatures
& Pressures

Cold water use only
150 psi @ 70°F
   60 psi @ 140°F

10 Bar @ 20°C
  4 Bar @ 60°C 

Cold water use only
150 psi @ 73°F
 100 psi @ 158°F

10 Bar @ 23°C
   7 Bar @ 70°C 

Cold water use only
160 psi @ 73°F
 100 psi @ 180°F

11 Bar @ 23°C
   6.8 Bar @ 82°C 

Cold water use only
250 psi @ 75°F
 100 psi @ 180°F

17.25 Bar @ 24°C
   6.8   Bar @ 82°C 

CertificationNSF/ANSI Standard 58
(approved for use as a component within NSF/ANSI certified systems)
NSF/ANSI Standard 51/61NSF/ANSI Standard 51/61NSF/ANSI Standard 61
OriginMade in U.S.A.Made in U.K.Made in U.K.Made in China
 Browse Mur-lokBrowse JG SpeedfitBrowse JG CTSBrowse SeaTech

Tubing Materials

Quick-connect push-in fittings can be used with any of the following ridgid and semi-ridgid tubing:
* Some types of soft or thin-walled tubing, such as PVC, can be used with the addition of plastic inserts.

Applications & Industries

  • RO Systems
  • Water Conditioning
  • Water Softeners
  • Icemakers
  • Office Coffee Service (OCS)
  • Beverage Vending
  • Misting Systems
  • Medical and Dialysis
  • Compressed Air
  • Pneumatic