Best Double Check Valves

Air-Operated Double Diaphragm Pump QBK-25L Heavy Duty Dual Diaphragm Air Pump 1 Inlet & Outlet Cast Iron 24 GPM 29-115 PSI for Chemical Industrial Use

【HIGH QUALITY】A diaphragm pump (also known as a Membrane pump) is a positive displacement pump that uses a combination of the reciprocating action of a rubber, thermoplastic or teflon diaphragm and suitable valves on either side of the diaphragm (check valve, butterfly valves, flap valves, or any other form of shut-off valves) to pump a fluid..
【FUNCTION】Our Diaphragm Pumps are compact, light weight, with good abrasion resistance, heat resistance and long service life. Motor design delivers optimum air efficiency..
【NOTE】Not suitable for acid, alkali and other corrosive liquids..
【WIDELY USED】This powerful and efficient Double Diaphragm Pump is perfect for all your needs in every industry,such as petroleum, metallurgy, coating material, mining, printing, paper making, water treatment and automotive, etc..
【BEST SERVICE】100% Refund Guarantee, please be assured the purchase. Our products are sent from the US and can be delivered quickly. If you have any questions or quality issue,please feel free to contact us. NICE CHOOSE will do our best to help you solve the problem..

Replacement for General Pump Check Valves Kit - Kit 1, Valves and O-Rings (K01).
Complete Valve Kit Includes Six O-rings and Six Check Valves Complete.
High Quality Material for Best Performance.

Body Material:Stainless Steel 316,200PSI/PN16,ANSI B1.20.1.
Working Pressure 200 WOG,Port Types:Female x Female threaded.
Temperature range: -60 to 450 degree Fahrenheit,Suitable for full range of liquids and gas.
Check valves are used to help direct flow in one direction. The stainless steel bodies and PTFE seals are highly corrosion resistant allowing these check valves to be used with a wide variety of fluids including, but not limited to water, oil, gas, air, light alkali's, acids, biodiesel, fuels and alcohols..
Swing check valves are for horizontal use only. When fluid pushes on the stopper in the correct direction, it will "swing" open to allow flow. If flow moves in the opposite direction, it will swing shut. The check valve cannot be used in vertical applications as gravity may affect the function of the swinging motion..

Replacement filters for the Pure UF-3 system sediment pre-filter reduces dirt, silt and rust.
the carbon pre-filter reduces chlorine taste.
the UF membrane reduces unwanted chemicals and the VOC Carbon Block Filter reduces lead and chemicals like MTBE's, atrazine, and benzene.
Kit includes two Sediment Filters, two Carbon Block Filters, and one Hollow-Fiber Membrane.
This space-saving, compact design allows this system to fit comfortably under your sink, requires fewer tube connections, includes back-flow prevention valves installed between the elements and cartridges have double O-rings so they won't leak.
The easy, quick-change push release filter system allows for easy filter change with no need to shut off the water source, is installed with check valves in the filter lid between cartridges to prevent back-flow and shut off valves in each filter head that shuts off the water flow when cartridges are removed.
Maximum operating pressure is 80 psi and to maintain top performance replace sediment and carbon block filters every 6 months, UF membrane filter every 12 months.

Package Includes：14feet clear tubing,2pcs 1" air stones,2pcs check valves,2pcs clear T connectors,6pcs clear suction cups.
Airline tubing: standard 3/16" diameter common to most airline accessories.
Air stones: durable and can produce fine bubbles continuously to diffuse oxygen efficiently in your fish tank.
Check valves: place these air pump check valves in your airline tubing between your air pump and aquarium water to prevent water returning down the air line.
Suction cups and T connectors: fit 3/16 inch ID standard airline tubing.

Water-resistant for safe use near pools, lakes and beaches.
Inflate boats, towables and floats from a vehicle or boat.
Designed to fit Sevylor Double Lock Valves.
Added adaptors fit Sevylor Mini Double Lock Valves, Boston valves and pinch valves.

Specially designed non-return valves will protect your air pump by preventing aquarium water from back siphoning during a power outage.
They are made of plastic material for long time use.
Place these air pump check valves in your airline tubing between your air pump and aquarium water to prevent water returning down the air line.
Fits standard aquarium airline tubing with inner diameter about 4mm.

Specially designed non-return valves will protect your air pump by preventing aquarium water from back siphoning during a power outage.
They are made of plastic material for long time use.
Place these air pump check valves in your airline tubing between your air pump and aquarium water to prevent water returning down the air line.
Fits standard aquarium airline tubing with inner diameter about 4mm.