In the plumbing trade, the size of copper tubing is measured by its outside diameter in millimeters. Common sizes are 15 mm and 22 mm. Other sizes include 18 mm, 28 mm, 35 mm, 42 mm, 54 mm, 66.7 mm, 76.1 mm, and 108 mm outside diameters.

19mm = 3/4 inch. 22mm = almost 7/8 inch. 23mm = 29/32 inch.

The threads on compression fittings are usually 1/2″ BSP and 3/4″ BSP (for the 15mm and 22mm fittings).

3/4 and 22mm are not compatible.

7/8″

As the pipe length increases, friction pushes against the flow, resulting in pressure loss. The “length” input for the equation is increased by the factors of pipe length and fittings. Pressure loss and efficiency decreases when the flow velocity increases.

Flow rate varies inversely to length, so if you double the length of the pipe while keeping the diameter constant, you’ll get roughly half as much water through it per unit of time at constant pressure and temperature.

six to eight months

Any restriction to pipework will reduce the flow, the length of the restriction is immaterial, IT IS A RESTRICTION. Flexible pipes on mains applications may be OK due to higher pressures involved. Anything connected to a tank in the loft should not be restricted if possible.

The good news is that some of the major lawn and garden manufacturers have stepped up their games. Nowadays, several expandable hoses are a good quality choice for the money. You can easily find 50- to 100-foot hoses in the $25-$50 range—not much different from old-fashioned hoses.

five to 10 years

A: Absolutely. Rubber hoses can kink up or knot, and you need to coil them back into shape when you’re finished with them. Expandable hoses are self-draining, and they coil up on their own when you turn off the water. They are just as useful as conventional rubber hoses, and they’re designed not to tear or tangle.

Our Top Picks

• BEST OVERALL: Aterod Expandable Garden Hose.
• BEST BANG FOR THE BUCK: Knoikos Expandable Garden Hose.
• UPGRADE PICK: Delxo Water Hose.
• BEST WITH BRASS FITTINGS: GrowGreen Heavy Duty Expandable Garden Hose.
• BEST WITH 4 LAYER CORE: TBI Pro Garden Hose Expandable and Flexible.
• ALSO CONSIDER: HBlife 100ft Garden Hose.

Here are their favorites.

• Best overall garden hose. Flexzilla Garden Hose, 25 Feet. $51 now 24% off.
• Most aesthetically pleasing garden hose. Heritage Garden Hose. From $68.
• Best expandable hose. TBI Pro Garden Hose. $38.
• Best soaker garden hose. Hoselink Soaker Hose. $32.
• Best drip irrigation kit. Raised Bed Drip Watering Kit. $50.

A damaged expandable garden hose is repairable. While a patchwork tactic will work in the short term, it will likely re-tear once high pressure is forced through the tubing. A permanent solution is to break the hose and use connectors to join them back together.

If dual latex then expect to life span of few months. Check if the connectors are brass or plastic. If brass connectors are used then ensure the inner tube is not latex, as that will trigger chemical reaction and your hose will bust after few uses.

Yes, the expandable hose can be attached to an existing hose. If your existing hose has push in connectors you will need to get a push in adapter that has a threaded female end to be able to join the two hoses.

The zero g hose is 50 lighter in weight than standard garden hoses which provides for easy coiling maneuverability and compact storage. This repair use s a gilmour garden hose repair kit.