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LP 1st Stage Adaptors

The Scuba Doctor offers a large variety of low pressure (LP) first stage regulator port adaptors for recreational, technical, rebreather, sidemount and commercial diving applications.

Most low-pressure hoses are 3/8-inch male and most first stage low-pressure ports are 3/8-inch female. A few brands of first stages have a special low-pressure port that is 1/2-inch female, notably some Apex and older Aqualung models. We offer 1/2-inch to 3/8-inch adaptors.

Reminder: The actual configuration of an adaptor is a mirror image of its use. A 3/8"-24 UNF FEMALE port requires a 3/8"-24 UNF MALE adaptor etc. In technical diving operations where many fittings may get co-mingled, be sure that all adaptor combinations can accommodate the intended flows and pressures.

Looking for a particular fitting you don't see here? Let us know and we'll see if we can order it for you.

We reserve the right to limit order quantities to less than 10 pieces because our supply is appropriate for the demands of individual divers, but not bulk orders. Large volume bulk orders will NOT qualify for our free shipping promotion.


3/8" UNF Male x Female Manifold Adaptor for Inspo/Evo Rebreather
Category Path: HOSES HARDWARE and CARE > MIFLEX Hoses / Accessories > Miflex Hose Adaptors

3/8" UNF Male x Female Manifold Adaptor for Inspo/Evo Rebreather

3/8" UNF Male x Female Adaptor for standard hoses to connect to Rebreather Manifolds The 3/8" UNF Male x Female Manifold Adaptor allows for...
$24.00
Alpha LP 3/8" Male to 9/16" Male UNF Adaptor
Category Path: SCUBA and WATERSPORTS > Scuba Diving TECHNICAL > Adaptors / Special Fittings > LP 1st Stage Adaptors

Alpha LP 3/8" Male to 9/16" Male UNF Adaptor

The Alpha Low Pressure (LP) 3/8 inch Male to 9/16 inch Male UNF adaptor converts 1st stage thread to second stage thread. The 3/8-inch 24-UNF Male...
$23.00
AP Diving LP 3/8" Male Inflator/Regulator Hose Shortener
Category Path: SCUBA and WATERSPORTS > Scuba Diving TECHNICAL > Adaptors / Special Fittings > LP 1st Stage Adaptors

AP Diving LP 3/8" Male Inflator/Regulator Hose Shortener

The AP Diving LP 3/8-inch Male Inflator/Regulator Hose Shortener lets you shorten, or repair if damaged, a rubber low-pressure regulator or inflator...
$33.00

Mares XR Over Pressure Relief Valve (OPV)
Category Path: COMING SOON Brands-Manufacturers > Mares

Mares XR Over Pressure Relief Valve (OPV)

The Mares XR Over Pressure Relief Valve (OPV) releases any build up of pressure inside your first stage regulator. Fitted to one of your LP ports...
$30.00
Sonar LP 3/8" Male to 1/2" Female UNF Adaptor
Category Path: SCUBA and WATERSPORTS > Scuba Diving RECREATIONAL > REGULATORS > Regulator Hose Adaptors

Sonar LP 3/8" Male to 1/2" Female UNF Adaptor

The Sonar Low Pressure (LP) 3/8 inch Male to 1/2 inch Female UNF adaptor enables you to connect a 1/2" Male end LP hose to any dive regulator...
$16.00

Sonar LP 3/8" Male to 3/8" Female 1st Stage Elbow Swivel Adaptor
Category Path: SCUBA and WATERSPORTS > Scuba Diving TECHNICAL > Adaptors / Special Fittings > LP 1st Stage Adaptors

Sonar LP 3/8" Male to 3/8" Female 1st Stage Elbow Swivel Adaptor

The Sonar Low Pressure (LP) 3/8 inch Male to 3/8 inch Female 1st Stage L-Shaped Elbow Swivel Adaptor redirects a low pressure port on a first stage...
$30.00

Sonar LP 3/8" Male to Dual 3/8" Female 1st Stage Adaptor
Category Path: SCUBA and WATERSPORTS > Scuba Diving TECHNICAL > Adaptors / Special Fittings > LP 1st Stage Adaptors

Sonar LP 3/8" Male to Dual 3/8" Female 1st Stage Adaptor

The Sonar Low Pressure (LP) 3/8" Male to Dual 3/8" Female 1st Stage Adaptor is used to increase the number of low pressure ports on a first...
$30.00
Sonar LP 3/8" Male to Three 3/8" Female UNF Adaptor
Category Path: SCUBA and WATERSPORTS > Scuba Diving TECHNICAL > Adaptors / Special Fittings > LP 1st Stage Adaptors

Sonar LP 3/8" Male to Three 3/8" Female UNF Adaptor

Do you need two more Low Pressure Ports on your Scuba Regulator? Use the Sonar LP 3/8" Male to Three 3/8" Female UNF Triple Adaptor to add...
$47.00
Sonar LP 3/8" Male to Two 3/8" Female UNF T-Port Adaptor
Category Path: SCUBA and WATERSPORTS > Scuba Diving TECHNICAL > Adaptors / Special Fittings > LP 1st Stage Adaptors

Sonar LP 3/8" Male to Two 3/8" Female UNF T-Port Adaptor

Do you need another Low Pressure Port on your Scuba Regulator? Use the Sonar LP 3/8" Male to Two 3/8" Female UNF T-Port Adaptor to add an additional...
$42.00
Sonar LP 3/8" Male UNF Safety Over Pressure Valve (OPV)
Category Path: SCUBA and WATERSPORTS > Scuba Diving RECREATIONAL > REGULATORS > Regulator Accessories / Parts

Sonar LP 3/8" Male UNF Safety Over Pressure Valve (OPV)

The Sonar Low Pressure (LP) 3/8 inch Male UNF standard safety Over Pressure Relief Valve (OPV or OPRV) is factory set for 175 to 185 psi for pressure...
$18.00
Sonar LP One-Way Inline Check Valve - 3/8" Male to Apeks QD
Category Path: SCUBA and WATERSPORTS > Scuba Diving TECHNICAL > Adaptors / Special Fittings > LP 1st Stage Adaptors

Sonar LP One-Way Inline Check Valve - 3/8" Male to Apeks QD

The Sonar Low Pressure (LP) 3/8 inch UNF Male to Apeks/SeaQuest Male Quick Disconnect (QD) One-Way Inline Check Valve prevents the influx of water...
$27.00
Sonar LP One-Way Inline Check Valve - 9/16" Male to Apeks QD
Category Path: SCUBA and WATERSPORTS > Scuba Diving TECHNICAL > Adaptors / Special Fittings > LP 1st Stage Adaptors

Sonar LP One-Way Inline Check Valve - 9/16" Male to Apeks QD

The Sonar Low Pressure (LP) 9/16 inch UNF Male to Apeks/SeaQuest Male Quick Disconnect (QD) One-Way Inline Check Valve prevents the influx of water...
$27.00
Elbow LP - 3/8" Male to 3/8" Female 90 Degree First Stage
Category Path: SCUBA and WATERSPORTS > Scuba Diving RECREATIONAL > REGULATORS > Regulator Hose Adaptors

Elbow LP - 3/8" Male to 3/8" Female 90 Degree First Stage

Sonar Low Pressure (LP) 3/8"-24 UNF Male to 3/8"-24 UNF Female 90 degree first stage elbow to fit any 3/8"-24 UNF Female LP first...
$53.00

Adaptor LP - 1/2M x 3/8F UNF - to Suit Mares Regulator
Category Path: SCUBA and WATERSPORTS > Scuba Diving RECREATIONAL > REGULATORS > Regulator Hose Adaptors

Adaptor LP - 1/2M x 3/8F UNF - to Suit Mares Regulator

Alpha low pressure 1/2 inch Male to 3/8 inch Female UNF adaptor to suit Mares regulator. Allows you to connect a standard 3/8 inch regulator hose to...
$30.00
Adaptor LP - 1/2" Male to 3/8" Female UNF
Category Path: SCUBA and WATERSPORTS > Scuba Diving RECREATIONAL > REGULATORS > Regulator Hose Adaptors

Adaptor LP - 1/2" Male to 3/8" Female UNF

Sonar Low Pressure (LP) 1/2 inch Male to 3/8 inch Female UNF adaptor. For those regulators that have 1/2" Female UNF ports, now you can use this...
$19.00

The Scuba Doctor Australia
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1/49 Peninsula Ave
Rye Victoria 3941, Australia
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