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At AquaCave, we offer some of the best selection & best prices on John Guest Speed Fit Fittings for you marine, reef, and freshwater aquarium.

30 of 30 Items
  • John Guest 1/2" x 1/2" Bulkhead

    John Guest (JG)

    John Guest 1/2" x 1/2" Bulkhead

    John Guest 1/2" x 1/2" Bulkhead. Tube O.D.: 1/2"Tube O.D.: 1/2"Tube O.D.: 1/2"Tube O.D.: 1/2"How to make a connection: * Cut tube square It is essential that the outside diameter be free of score marks and that burrs and sharp edges be removed before...

    $9.95
  • Quick Connect Check Valve, 1/4" Quick Connect Check Valve, 1/4"

    John Guest (JG)

    Quick Connect Check Valve, 1/4"

    Quick Connect Check Valve, 1/4".Fits standard 1/4" RO tubing.Quick Connect Check Valve, 1/4". Fits standard 1/4" RO tubing.Product code: 2118Item No. RO-CV-ILCV09

    $9.95
  • John Guest 1/4" x 1/4" Female Elbow Adaptor Ball Valve John Guest 1/4" x 1/4" Female Elbow Adaptor Ball Valve

    John Guest (JG)

    John Guest 1/4" x 1/4" Female Elbow Adaptor Ball Valve

    Color: WhiteJohn Guest Part# : PPSV500822WTube O.D.: 1/4"Thread FPTF: 1/4"Color: WhiteJohn Guest Part# : PPSV500822WTube O.D.: 1/4"Thread FPTF: 1/4"How to make a connection: * Cut tube square It is essential that the outside diameter be free of...

    $8.95
  • John Guest 1/4" x 1/4" Male Adaptor Ball Valve John Guest 1/4" x 1/4" Male Adaptor Ball Valve

    John Guest (JG)

    John Guest 1/4" x 1/4" Male Adaptor Ball Valve

    Color: WhiteJohn Guest Part# : PPSV010822WTube O.D.: 1/4"Thread NPTF: 1/4"Color: White John Guest Part# : PPSV010822W Tube O.D.: 1/4" Thread NPTF: 1/4" How to make a connection: * Cut tube square It is essential that the outside diameter be free of score...

    $7.95
  • John Guest 1/4" x 1/4" Union Ball Valve

    John Guest (JG)

    John Guest 1/4" x 1/4" Union Ball Valve

    Color: WhiteJohn Guest Part# : PPSV040808WTube O.D.: 1/4"Tube O.D.: 1/4"Color: WhiteJohn Guest Part# : PPSV040808WTube O.D.: 1/4"Tube O.D.: 1/4"How to make a connection: * Cut tube square It is essential that the outside diameter be free of score...

    $7.95
  • John Guest 3/8" x 3/8" Bulkhead

    John Guest (JG)

    John Guest 3/8" x 3/8" Bulkhead

    John Guest 3/8" x 3/8" Bulkhead. Tube O.D.: 3/8"Tube O.D.: 3/8"Tube O.D.: 3/8"Tube O.D.: 3/8"How to make a connection: * Cut tube square It is essential that the outside diameter be free of score marks and that burrs and sharp edges be removed before...

    $7.95
  • John Guest 1/4" x 1/4" Bulkhead

    John Guest (JG)

    John Guest 1/4" x 1/4" Bulkhead

    John Guest 1/4" x 1/4" BulkheadTube O.D.: 1/4"Tube O.D.: 1/4"John Guest 1/4" x 1/4" Bulkhead John Guest Part# : PI1208STube O.D.: 1/4"Tube O.D.: 1/4"How to make a connection: * Cut tube square It is essential that the outside diameter be free of score...

    $5.95
  • John Guest 1/4" 2-way Divider

    John Guest (JG)

    John Guest 1/4" 2-way Divider

    John Guest 1/4" 2-way Divider John Guest Part# : PM2308STube O.D.: 1/4"How to make a connection:* Cut tube squareIt is essential that the outside diameter be free of score marks and that burrs and sharp edges be removed before inserting into fitting...

    $4.95
  • John Guest Release Tool Spanner

    John Guest (JG)

    John Guest Release Tool Spanner

    Color: GrayJohn Guest Part# : AC40Color: GrayJohn Guest Part# : AC40Size: for 1/4" or 3/8" tube useHow to make a connection: * Cut tube square It is essential that the outside diameter be free of score marks and that burrs and sharp edges be...

    $4.95
  •  John Guest 1/4" x 1/4" x 1/4" Union Tee- White

    John Guest (JG)

    John Guest 1/4" x 1/4" x 1/4" Union Tee- White

    Color: WhiteJohn Guest Part# : CI0208WTube O.D.: 1/4"Tube O.D.: 1/4"Tube O.D.: 1/4"Color: WhiteJohn Guest Part# : CI0208WTube O.D.: 1/4"Tube O.D.: 1/4"Tube O.D.: 1/4"How to make a connection: * Cut tube square It is essential that the outside...

    $4.69
  • John Guest 3/8" x 1/4" NPTF Male Elbow - Gray

    John Guest (JG)

    John Guest 3/8" x 1/4" NPTF Male Elbow - Gray

    Color: GrayJohn Guest Part# : PI481222STube O.D.: 3/8"Thread NPTF: 1/4"Color: GrayJohn Guest Part# : PI481222STube O.D.: 3/8"Thread NPTF: 1/4"How to make a connection: * Cut tube square It is essential that the outside diameter be free of score...

    $4.69
  • John Guest 1/4" x 7/16" UNS Thread Faucet Connector

    John Guest (JG)

    John Guest 1/4" x 7/16" UNS Thread Faucet Connector

    John Guest 1/4" x 7/16" UNS Thread Faucet Connector 1/4OD by 7/16-24 UNS faucet connector pushfit plastic fitting for the connection of plastic or copper tube. NSF 51 and NSF 61 listed. Designed, manufactured and assembled in the UK by John Guest...

    $3.99
  •  John Guest 1/4" x 1/4" Union Elbow- White

    John Guest (JG)

    John Guest 1/4" x 1/4" Union Elbow- White

    Color: WhiteJohn Guest Part# : CI0308WTube O.D.: 1/4"Tube O.D.: 1/4"Color: WhiteJohn Guest Part# : CI0308WTube O.D.: 1/4"Tube O.D.: 1/4"How to make a connection: * Cut tube square It is essential that the outside diameter be free of score marks...

    $3.89
  • John Guest 1/4" x 1/4" NPTF Male Elbow - White

    John Guest (JG)

    John Guest 1/4" x 1/4" NPTF Male Elbow - White

    Color: WhiteJohn Guest Part# : CI489821WTube O.D.: 1/4"Thread NPTF: 1/4"Color: WhiteJohn Guest Part# : CI489821WTube O.D.: 1/4"Thread NPTF: 1/4"How to make a connection: * Cut tube square It is essential that the outside diameter be free of score...

    $3.69
  • John Guest 1/4" x 3/8" NPTF Male Adapter - Gray

    John Guest (JG)

    John Guest 1/4" x 3/8" NPTF Male Adapter - Gray

    Color: GrayJohn Guest Part# : PI010823STube O.D.: 1/4"Thread NPTF: 3/8"Color: GrayJohn Guest Part# : PI010823STube O.D.: 1/4"Thread NPTF: 3/8"How to make a connection: * Cut tube square It is essential that the outside diameter be free of score...

    $3.69
  • John Guest 1/4" x 1/4" Union Connector - White

    John Guest (JG)

    John Guest 1/4" x 1/4" Union Connector - White

    Color: WhiteJohn Guest Part# : CI0408WTube O.D.: 1/4"Tube O.D.: 1/4"Color: WhiteJohn Guest Part# : CI0408WTube O.D.: 1/4"Tube O.D.: 1/4"How to make a connection: * Cut tube square It is essential that the outside diameter be free of score marks...

    $3.39
  • John Guest 1/4" x 1/8" NPTF Male Elbow - White

    John Guest (JG)

    John Guest 1/4" x 1/8" NPTF Male Elbow - White

    Color: WhiteJohn Guest Part# : CI489821WTube O.D.: 1/4"Thread NPTF: 1/8"Color: WhiteJohn Guest Part# : CI489821WTube O.D.: 1/4"Thread NPTF: 1/8"How to make a connection: * Cut tube square It is essential that the outside diameter be free of score...

    $3.39
  • John Guest 1/4" x 3/8" Reducer - Grey John Guest 1/4" x 3/8" Reducer - Grey

    John Guest (JG)

    John Guest 1/4" x 3/8" Reducer - Grey

    Color: GrayJohn Guest Part# : PI061208SColor: GrayJohn Guest Part# : PI061208SHow to make a connection: * Cut tube square It is essential that the outside diameter be free of score marks and that burrs and sharp edges be removed before inserting...

    $2.99
  • John Guest 1/4" x 1/4" NPTF Male Adapter - White

    John Guest (JG)

    John Guest 1/4" x 1/4" NPTF Male Adapter - White

    Color: WhiteJohn Guest Part# : CI010822WTube O.D.: 1/4"Thread NPTF: 1/4"Color: WhiteJohn Guest Part# : CI010822WTube O.D.: 1/4"Thread NPTF: 1/4"How to make a connection: * Cut tube square It is essential that the outside diameter be free of score...

    $2.49
  • John Guest 1/4" x 1/8" NPTF Male Adapter - White

    John Guest (JG)

    John Guest 1/4" x 1/8" NPTF Male Adapter - White

    Color: WhiteJohn Guest Part# : CI010821WTube O.D.: 1/4"Thread NPTF: 1/8"Color: WhiteJohn Guest Part# : CI010821WTube O.D.: 1/4"Thread NPTF: 1/8"How to make a connection: * Cut tube square It is essential that the outside diameter be free of score...

    $2.29
  • John Guest 1/4" x 1/4" Stem Adapter - White

    John Guest (JG)

    John Guest 1/4" x 1/4" Stem Adapter - White

    Color: WhiteJohn Guest Part# : CI050822WStem O.D.: 1/4"Thread NPTF: 1/4"Color: WhiteJohn Guest Part# : CI050822WStem O.D.: 1/4"Thread NPTF: 1/4"How to make a connection: * Cut tube square It is essential that the outside diameter be free of score...

    $1.39
  • John Guest 1/4" x 5/16" Stem Adapter - Gray

    John Guest (JG)

    John Guest 1/4" x 5/16" Stem Adapter - Gray

    Color: GrayJohn Guest Part# : PM050822SStem O.D.: 5/16"Thread NPTF: 1/4"Color: GrayJohn Guest Part# : PM050822SStem O.D.: 5/16"Thread NPTF: 1/4"How to make a connection: * Cut tube square It is essential that the outside diameter be free of score...

    $1.39
  • John Guest 1/4" x 1/8" Stem Adapter - White John Guest 1/4" x 1/8" Stem Adapter - White

    John Guest (JG)

    John Guest 1/4" x 1/8" Stem Adapter - White

    Color: WhiteJohn Guest Part# : CI050821WStem O.D.: 1/4"Thread NPTF: 1/8"Color: WhiteJohn Guest Part# : CI050821WStem O.D.: 1/4"Thread NPTF: 1/8"How to make a connection: * Cut tube square It is essential that the outside diameter be free of score...

    $1.29
30 of 30 Items